Add Terraform option to environment_setup

[zoekdestep]

To fix enhancement #251 .

Create the required infrastructure using Terraform:

• Added TF pipeline .yml (iac-create-environment-pipeline-tf.yml)
• Added .tf files that create the required resources (tf-templates/main.tf and tf-templates/backend.tf)
• Updated naming of ARM pipeline .yaml (iac-create-environment-pipeline-arm.yml)
• Updated documentation (code_description.md and getting_started.md)

[msftclas]

All CLA requirements met.

[j-so]

I'm quite new to terraform. Is there a need to make a tf version of iac-remove-environment-pipeline?

LGTM assuming it works e2e with a test CI/CD deploy.

[zoekdestep]

Hi @j-so ! Hypothetically I think it's possible, but I wouldn't say it's necessary, because removing the environment (==deleting the RG) is as simple as running a .yml file with a AzureResourceGroupDeployment@2 task (not even an ARM template is required for this). For sake of simplicity, I would personally go for just deleting the RG with the already-existing .yml.