docs: add links to Terraform website and state overview (#14)

Author: hknutsen

README.md

@@ -6,7 +6,7 @@
 
 [![Deploy to Azure](https://docs.microsoft.com/en-us/azure/templates/media/deploy-to-azure.svg)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2Fequinor%2Fazure-terraform-backend-template%2Fmain%2Fazuredeploy.json)
 
-Azure Resource Manager (ARM) template that creates an Azure Storage account to store Terraform state files:
+Azure Resource Manager (ARM) template that creates an Azure Storage account to store [Terraform](https://www.terraform.io) [state](https://developer.hashicorp.com/terraform/language/state) files:
 
 - Creates a storage account with the specified name.
 - Configures the storage account according to [security recommendations](https://learn.microsoft.com/en-us/azure/storage/blobs/security-recommendations).