Automatically create provider file if it doesn't exist

[kmcquade]

Right now if you create the Terraform file and then try to apply it, you'll get this error:

Error: "features": required field is not set

It's a silly requirement by the Terraform Azure provider.

I should write something that greps through the .tf files in that directory and creates a file with that content if it doesn't exist. This will make it easier for people trying this out.