Update developer instructions in README (#199)
Update developer instructions in README (#199)

* Update developer instructions in README

* Update README with testing instructions

Unit testing with the new Docker setup is still in flux, so I haven't
written instructions for it. I'll update the README again with
instructions on how to run the unit tests once I settle on a method.
sillsdev/LfMerge,sillsdev/LfMerge,sillsdev/LfMerge