EF Core .Include() support

[idan-h]

Hey, first of all thank you for this repo.
I tried to find a solution for including a specific foreign key object in EF Core by using the .Include() method on the DbSet, but I couldn't find one.. Is it possible to implement? Am I missing something?
I am willing to do a PR which adds the feature if doesn't exist, but I don't undestand enough about this repo to implement it yet. Some guidence will be appreciated.

Thank you!