Initial commit of README text.

Explaining how we use this repo.
Moves wiki into files within the repo.
Rename Development-Environment-Setup:-Mac-OS-X.md to Mac-OS-X.md
Updates README with releative links.
Renames files.
Merge pull request #2 from StartupInstituteBoston/master

Moves wiki into main repo to allow for Pull Requests.  Other upgrades to install docs.