Setup some infrastructure for the repository. #60
This sets up a lot of infrastructure for the repository including using Directory.Build.props/targets and adding various scripts for building, restoring, testing, and packing.
I believe the ultimate end-goal is to get on dotnet/arcade, but this should still be a step in the right direction.
It does not currently enable strong-name signing (as it needs to be determined if a custom or existing strong name key will be used). It would also be trivial to hook up authenticode signing once that is resolved.
If we have an existing AzDO repo, I can also add the