Update README with add and getting started instructions
Failing test for simple file add
Make ChattyCommand object for running things
Not enough patched OS - fixing tests

... just the one left to fix now by providing functionality
Cleanup how patching of `os` takes place in tests
Further test cleanup merge old tests
Adding basic add functionality to ChattyFile
Add basic add functionality to the Repository
Wire add function into top level command line handling
Update README and fix flake8