*Please* provide public documentation for CPS

Currently, there is no public documentation for how to use CPS to create or extend project types. As I have indicated in previous issues, the VSProjectSystem repo is dead as a doornail (it has not been committed to since March, and issues there are ignored by MS contributors). When I saw “for more information, consult our private repository” in #6724, which introduces public documentation, I became most irritated.

The CPS NuGet packages on nuget.org provide some API in the form of IntelliSense member-documentation XML files. This is the only documentation I can find _anywhere_ for how to use CPS. Unfortunately, those NuGet packages have not been updated since June 2019. Newer versions of CPS are only distributed in a (supposedly) public NuGet feed hosted in Azure DevOps, but it is clear that the feed is really intended for MS-internal use only. (I don’t even know which NuGet feed it is, as there are [several listed](https://github.com/dotnet/project-system/blob/ce4a68d896a468bf936057a719debee38ca97085/build/import/Packages.targets#L7-L19)).

I (and others) have asked this question multiple times in the past; usually all we get in response is crickets. To put it bluntly, I am **sick and tired** of MS ignoring our community input. Over the past few months or so, Microsoft’s open source projects have become just one big “Please wait, announcement coming soon” sign. (Project Reunion — big talk, little code, and there has been zero progress towards making that code usable without major modifications. WinUI 3 — neither talk nor code in recent memory. Furthermore, the CsWinRT component used alongside WinUI 3 is now incompatible with it. The only response given as to how to fix that is “use WinUI 3 preview 3” — except that preview 3 has not been released to anyone outside MS. And so on.)

I could have filed this issue in a number of repos across Microsoft, but I am filing it here because the “see private repository” comment is the straw that broke my camel’s back. **Please** do something about this. Thank you.