Create TF template for Azure App Service

[rin-skylight]

Background

We would like to provide a self-service option that allows users to leverage pre-existing templates to aid in the conversion from AWS, Google Cloud, or on-premise resources to Azure-based Terraform.

Action requested

Create a template folder that contains the necessary files for creating an App Service object in Azure.

Acceptance Criteria

• main, _var, _data, and _output files should all be present.
• Files should be complete with easily-replaceable variables that follow consistent naming conventions.
• Proper comments and documentation should be added throughout the files.
• Any optional pieces should be surrounded with comments, so that end users can enable and disable as desired.

Additional context

This will enable the NBS team to leverage our files for guidance as they action the conversion to Azure.

[boris-ning-usds]

On the CDC Enterprise side, we placed our tf modules in cdcent/cdc-coe-tf-modules. I'll be happy to move this over and see what a good template should be.

We want to move some of our other assets from cdcent/data-exchange-infra to modules too, but haven't gotten around to doing it.

Some assets are more tricky than others, because of the limited "contributor light" role we're given. cc: @emmanuel-apau