Packaging Documentation within the nupkg

[PeterOrneholm]

Is your feature request related to a problem? Please describe.
NuGet and NuGet.org now supports Packaging Documentation within the nupkg. This allows for docs to be versioned for the specific package you use, offline scenarios and documentatyion next to the package at nuget.org.

https://github.com/NuGet/Home/wiki/Packaging-Documentation-within-the-nupkg

What area is it related to
All packages

Describe the solution you'd like
Embed a small Readme.md per package, that is more to the point on what that package does.

[PeterOrneholm]

Turns out it does not support readme.md, but we could (should) embed a lightweight readme.txt per project as we do in https://github.com/ActiveLogin/ActiveLogin.Authentication.