Create CONTRIBUTING.md

CONTRIBUTING.md

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+## How to contribute
+Government employees, public and members of the private sector are encouraged to contribute to the repository by **forking and submitting a pull request**. 
+
+(If you are new to GitHub, you might start with a [basic tutorial](https://help.github.com/articles/set-up-git) and  check out a more detailed guide to [pull requests](https://help.github.com/articles/using-pull-requests/).)
+
+Pull requests will be evaluated by the repository guardians on a schedule and if deemed beneficial will be committed to the master.
+
+All contributors retain the original copyright to their stuff, but by contributing to this project, you grant a world-wide, royalty-free, perpetual, irrevocable, non-exclusive, transferable license to all users **under the terms of the license under which this project is distributed.**