Is your feature request related to a problem? Please describe.
I saw references to the delta API in PRs and wanted to use DeltaTable, but could not resolve, since it exists in Microsoft.Spark.Extensions.Delta rather than the main package.

I then went to the readme and searched for delta, but couldn't find anything.
The nuget package link also redirects to the main package.
The landing page at https://dotnet.microsoft.com/apps/data/spark also doesn't mention it.

Describe the solution you'd like
Would it make sense to mention delta and / or the other packages in the readme?
I think this could improve discoverability.