Add READMEs to all sample code folders

ch1/ec2-user-data-script/README.md

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+# EC User Data Script
+
+This folder contains:
+
+* `user-data.sh`: A script that you can copy into the user data of an EC2 instance to get that instance to run a
+  simple Node.js "Hello, World" server on port 80.
+
+For more information, see Chapter 1, "How to Deploy Your App", of [_Fundamentals of DevOps and Software
+Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch1/sample-app/README.md

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+# Node.js Sample App for Fly.io
+
+This folder contains:
+
+* `app.js`: A simple Node.js "Hello, World" server that listens on port 8080.
+* `fly.toml`: A configuration file you can use to run the Node.js app on Fly.io.
+
+For more information, see Chapter 1, "How to Deploy Your App", of [_Fundamentals of DevOps and Software
+Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch2/ansible/README.md

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+# Ansible EC2 Instance
+
+This folder contains:
+
+* `create_ec2_instance_playbook.yml`: An Ansible playbook to create an EC2 instance.
+* `configure_sample_app_playbook.yml`: An Ansible playbook to configure an EC2 instance to run a Node.js "Hello, World"
+  sample app that listens on port 8080. Under the hood, uses the Ansible roles in the `roles` folder.
+* `inventory.aws_ec2.yml`: An Ansible dynamic inventory file to discover EC2 instances, which along with the 
+  `group_vars` folder will allow you to connect to those instances and can configure them.
+
+For more information, see Chapter 2, "How to Manage Your Infrastructure as Code", of [_Fundamentals of DevOps and 
+Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch2/bash/README.md

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+# EC2 Instance Bash Script
+
+This folder contains:
+
+* `deploy-ec2-instance.sh`: A Bash script that deploys an EC2 instance and configures it to run a Node.js "Hello, World"
+  app that listens on port 8080.
+
+For more information, see Chapter 2, "How to Manage Your Infrastructure as Code", of [_Fundamentals of DevOps and
+Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch2/packer/README.md

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+# Node.js Sample App Packer Template
+
+This folder contains:
+
+* `app.js`: A Node.js "Hello, World" sample app that listens on port 8080.
+* `sample-app.pkr.hcl`: A Packer template that can create an AMI that has the Node.js sample app installed.
+
+For more information, see Chapter 2, "How to Manage Your Infrastructure as Code", of [_Fundamentals of DevOps and
+Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch2/tofu/ec2-instance/README.md

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+# EC2 Instance OpenTofu Module
+
+This folder contains a root OpenTofu module that deploys an EC2 instance which runs a Node.js "Hello, World" sample app 
+that listens on port 8080.
+
+For more information, see Chapter 2, "How to Manage Your Infrastructure as Code", of [_Fundamentals of DevOps and
+Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch2/tofu/live/sample-app-github/README.md

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+# EC2 Instance OpenTofu Module
+
+This folder contains a root OpenTofu module that uses the 
+[ec2-instance reusable OpenTofu module](../../modules/ec2-instance) directly from a GitHub URL to deploy an EC2 
+instance which runs a Node.js "Hello, World" sample app that listens on port 8080.
+
+For more information, see Chapter 2, "How to Manage Your Infrastructure as Code", of [_Fundamentals of DevOps and
+Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch2/tofu/live/sample-app/README.md

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+# EC2 Instance OpenTofu Module
+
+This folder contains a root OpenTofu module that uses the 
+[ec2-instance reusable OpenTofu module](../../modules/ec2-instance) to deploy an EC2 instance which runs a Node.js 
+"Hello, World" sample app that listens on port 8080.
+
+For more information, see Chapter 2, "How to Manage Your Infrastructure as Code", of [_Fundamentals of DevOps and
+Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch2/tofu/modules/ec2-instance/README.md

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+# EC2 Instance OpenTofu Module
+
+This folder contains a reusable OpenTofu module that deploys an EC2 instance which runs a Node.js "Hello, World" sample 
+app that listens on port 8080.
+
+For more information, see Chapter 2, "How to Manage Your Infrastructure as Code", of [_Fundamentals of DevOps and
+Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/ansible/README.md

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+# Ansible Server Orchestration
+
+This folder contains an example of how to do server orchestration with Ansible:
+
+* `create_ec2_instances_playbook.yml`: An Ansible playbook to create multiple EC2 instances. You can use it with 
+  `sample-app-vars.yml` to create EC2 instances for running Node.js sample apps or `nginx-vars.yml` to create an EC2
+  instance for running Nginx.
+* `configure_sample_app_playbook.yml`: An Ansible playbook to configure an EC2 instance to run a Node.js "Hello, World"
+  sample app that listens on port 8080. Under the hood, uses the Ansible roles in the `roles` folder.
+* `configure_nginx_playbook.yml`: An Ansible playbook to configure an EC2 instance to run Nginx as a load balancer
+  that routes traffic across EC2 instances running the Node.js sample app.
+* `inventory.aws_ec2.yml`: An Ansible dynamic inventory file to discover EC2 instances, which along with the 
+  `group_vars` folder will allow you to connect to those instances and can configure them.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of 
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/docker/README.md

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+# Dockerized Node.js App
+
+This folder contains:
+
+* `app.js`: A Node.js "Hello, World" app that listens on port 8080.
+* `Dockerfile`: Instructions to build a Docker image for the Node.js sample app.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of 
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/kubernetes/README.md

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+# Kubernetes Deployment and Service
+
+This folder contains:
+
+* `sample-app-deployment.yml`: A Kubernetes `Deployment` for deploying a simple app that listens on port 8080.
+* `sample-app-service.yml`: A Kubernetes `Service` to act as a load balancer for the apps in the `Deployment`.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/packer/README.md

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+# Node.js App Packer Template
+
+This folder contains:
+
+* `app.js`: A Node.js "Hello, World" app that listens on port 8080.
+* `app.config.js`: A config file for running the Node.js sample app using PM2 as a process supervisor.
+* `sample-app.pkr.hcl`: A Packer template for creating an AMI for the Node.js sample app.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/live/asg-sample/README.md

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+# VM Orchestration Module
+
+This folder contains a root OpenTofu module that shows an example of VM orchestration. It uses the 
+[asg](../../modules/asg) module to deploy an ASG running a Node.js "Hello, World" app, and the [alb](../../modules/alb) 
+module to deploy an ALB that routes traffic across the ASG.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/live/ecr-sample/README.md

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+# Elastic Container Registry (ECR) Module
+
+This folder contains a root OpenTofu module that uses the [ecr-repo](../../modules/ecr-repo) module to create an ECR
+repo.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/live/eks-sample/README.md

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+# Container Orchestration Module
+
+This folder, along with [ecr-sample](../ecr-sample) and the [kubernetes objects](../../../kubernetes), contain an 
+example of container orchestration. This folder contains a root OpenTofu module that uses the 
+[eks-cluster](../../modules/eks-cluster) module to create an EKS cluster with a managed node group.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/live/lambda-sample/README.md

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+# Serverless Orchestration Module
+
+This folder contains an example of serverless orchestration. It contains a root OpenTofu module that uses 
+the [lambda](../../modules/lambda) to deploy a Node.js "Hello, World" app as Lambda function and the 
+[api-gateway](../../modules/api-gateway) to configure an API Gateway that sends HTTP requests to the Lambda function. 
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/modules/alb/README.md

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+# Application Load Balancer (ALB) Module
+
+This folder contains a reusable OpenTofu module that can deploy an ALB that can route HTTP traffic across and a target 
+group for an HTTP app.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/modules/api-gateway/README.md

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+# API Gateway Module
+
+This folder contains a reusable OpenTofu module that can deploy an HTTP v2 API Gateway that sends traffic to an AWS 
+Lambda function.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/modules/asg/README.md

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+# Auto Scaling Group Module
+
+This folder contains a reusable OpenTofu module that can deploy an Auto Scaling Group and optionally configure it to use
+instance refresh and to register in an ALB target group.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/modules/ecr-repo/README.md

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+# Elastic Container Registry (ECR) Module
+
+This folder contains a reusable OpenTofu module that can create an ECR repo.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/modules/eks-cluster/README.md

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+# Elastic Kubernetes Service (EKS) Module
+
+This folder contains a reusable OpenTofu module that can create an EKS cluster with a managed node group.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).

ch3/tofu/modules/lambda/README.md

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+# AWS Lambda Module
+
+This folder contains a reusable OpenTofu module that can package up a source folder as a Lambda deployment package
+(zip file) and deploy that code as a Lambda function.
+
+For more information, see Chapter 3, "How to Deploy Many Apps: Orchestration, VMs, Containers, and Serverless", of
+[_Fundamentals of DevOps and Software Delivery_](https://www.fundamentals-of-devops.com) by Yevgeniy Brikman.
+
+> [!IMPORTANT]  
+> This repo contains example code for learning and experimenting only, in conjunction with the book and blog post
+> series. This code is _not_ designed for direct production usage. If you're looking for code you can use directly in
+> production, check out the [Gruntwork Library](https://www.gruntwork.io/products/library).