Create TF template for Azure Front Door

[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 a Front Door 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.

[rin-skylight]

This may be an example of over-planning...we won't need this if the AGIC setup goes as planned. Icing for now; we can revisit this if the App Gateway setup goes poorly.