Fill out nupkg metadata completely

[eerhardt]

System information

• OS version/distro: All
• .NET Version (eg., dotnet --info): All

Issue

• What did you do?

Inspect the NuGet metadata for Microsoft.ML

• What happened?

Only some of the info is filled out. For example, for "description" it says "Package Description". It also doesn't have a link to release notes or license/project URL.

• What did you expect?

I expected all the info to be filled out.