Merge pull request #1068 in CATS/clowder from feature/CATS-685-contributing.md to release/1.0
* commit '825a9f976243cfe14c64c77e2289b54acd311a2b':
Added improvements to CONTRIBUTING.md
Added improvements to CONTRIBUTING.md
Links cleanup and made a few terms consistent throughout CONTRIBUTING.md
typos
Beginning CONTRIBUTING.md file.