Merge pull request #3 from LLNL/docs/ben/contributing

Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Merlin is open source software, and we welcome contribution!
+
+We follow a gitflow - like [this](http://www.dalescott.net/using-gitflow-with-githubs-fork-pull-model/).
+To contribute, fork your own copy.
+All changes are done via pull requests from your fork into the appropriate main repository branch.
+Features and additions into `develop`, hot fixes into `master`.
+
+### Squash
+Before merging a pull request, please [squash your commits](https://github.com/LLNL/merlin/wiki/Squash-commits) down to a single concise commit message.
+
+### More...
+Complete developer documentation is [here](https://merlin.readthedocs.io/en/latest/merlin_developer.html).
+