Add PowerShell Script for Validating READMEs

[alzimmermsft]

This PR adds a standard script for validating READMEs.

[azure-sdk]

The following pipelines have been queued for testing:
java - template
java - template - tests
js - template
net - template
net - template - tests
python - template
python - template - tests
You can sign off on the approval gate to test the release stage of each pipeline.
See eng/common workflow

[chidozieononiwu]

You could have done this as part of the other PR though.

[ghost]

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[alzimmermsft]

You could have done this as part of the other PR though.

Is there a way to propagate /eng/common/ changes from the individual language repos?

[weshaggard]

No there isn't any supported way. We should definitely start from the tools repo and then sync out to the language repos.

[weshaggard]

Cool I like that this is defaulted and I much prefer it here instead of needing to set it in all the language repos.

[weshaggard]

While the script is the core of the work we could have also included a Devop yml template that captures the call to this script as well.

[chidozieononiwu]

It seems that that will be mostly redundant because there is not much that the yml step will add, We can just add the powershell step directlry to the pipeline that calls docwarden.