add script and template to produce docs

[devigned]

Add Get-AllCommands.ps1 and templates to produce documentation and a documentation report from the Azure and AzureResourceManager modules.

The docs tools reside in tools/Docs/Get-AllCommands and will produce an output directory there which will contain the packaged docs output as well as a set of files which will show missing documentation from each cmdlet. This initial pull request will add this into the project and can be run from the cmdline after a build to produce the needed documentation. This will need to be integrated into the build system and into the pull request verification.

We should use the output of this script to verify all new pull requests are not lowering the overall documentation coverage. We should also use this script to produce documentation on release builds to provide to the content development team so that they are able to use the documentation to quickly update web published docs such as MSDN.

Thank you goes out to Jon Geller on the content team for his assistance in developing the script.

[azuresdkci]

Can one of the admins verify this patch?

[markcowl]

@azuresdkci add to whitelist

[ogail]

Fix alignment