Add README to NuGet packages

[loic-sharma]

Hello!

I am from the NuGet team at Microsoft. We recently introduced support for embedding READMEs into NuGet packages (blog, docs), and we plan to place these READMEs front and center on nuget.org. Would you be willing to accept a contribution to add embedded READMEs to your packages?

[lbargaoanu]

Sure. Thanks!

[loic-sharma]

I prepared the changes here but this is blocked by this bug: NuGet/Home#10791