Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+1. Fork it!
+2. Create your feature branch: `git checkout -b my-new-feature`
+3. Add files changed:  `git add .`
+4. Commit your changes: `git commit -m "Add some feature"`
+5. Push to the branch: `git push origin my-new-feature`
+6. Submit a pull request
+
+- The pull request and commit should have a useful title.
+
+**After your pull request is merged**
+
+After your pull request is merged, you can safely delete your branch.