Implement In-memory todo list repository
@yuriyoleynikov to take ownership of this PR and fill in more information
@yuriyoleynikov it may be better to close this pr and open a new one by yourself
I have added a test project (existing one has been removed) with a few tests.
Almost all the tests are failing except of a few that pass occasionally.
@yuriyoleynikov please pull and fix implementation and tests.
@yuriyoleynikov please open your own PR, I'm closing this one.