Fixes#42438
The substantive changes are to add a policy statement on closing stale or abandoned PRs to the readme.md.
Other changes are to remove files that were placeholders, and to update links to the appropriate location in the public contributor guide.
* Create admin notes
Add admin notes for our processes and labels in our repository.
* Apply suggestions from code review
Co-authored-by: David Pine <david.pine@microsoft.com>
* respond to feedback
* lint issue
* quick edit.
Co-authored-by: David Pine <david.pine@microsoft.com>