Add Docker support for running samples

[enveryasar]

Add Docker Support for Running Samples

Overview

This PR adds Docker support to the Bynder C# SDK, making it easier to run sample files without dealing with .NET version compatibility issues or complex environment setup.

Changes Made

• Added Dockerfile to create a container with .NET SDK 9.0
• Created docker-compose.yml to define service configuration
• Added Makefile with commands to simplify Docker operations
• Updated README.md with documentation on using Docker

Benefits

• Eliminates the need to install specific .NET versions on the host machine
• Provides consistent development environment across different platforms
• Simplifies running sample files with a standardized command structure
• Makes testing SDK functionality faster and more accessible

How to Use

Simply follow the instructions in the README.md:

1. Create a Config.json file with Bynder credentials
2. Run make run-docker to start the container
3. Execute samples with make executeSdkSample sample-name=BrandsSample
4. When finished, run make stop-docker

Testing Done

Successfully tested running all sample files through Docker on macOS.

[coveralls]

coverage: 53.518%. remained the same
when pulling 466aaab on docker-support-sample
into 09c9177 on master.