Learn lists - using the NUnit constraint model assertions

Signed-off-by: Igor Popov <igor@igorpopov.io>
Add tests for learning how to use a Dictionary

Signed-off-by: Igor Popov <igor@igorpopov.io>
Add LINQ tests

Signed-off-by: Igor Popov <igor@igorpopov.io>
Add tests for delegates

Signed-off-by: Igor Popov <igor@igorpopov.io>