Squashed 'moose-core/' changes from 69e0354705..b096503233

REVERT: 69e0354705 Create CONTRIBUTING.md

git-subtree-dir: moose-core
git-subtree-split: b09650323312b56d2cfb777947f5db45f44b578a

CONTRIBUTING.md

-To contribute, fork this repo and submit your changes via a pull-request.
-Before sending pull-request, check the following:
-
-- [ ] Software builds locally
-- [ ] `ctest --output-on-failure` passes all tests.