Create CONTRIBUTING file

Author: tplive

Diff for: CONTRIBUTING.md

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+# Contributing
+Contributions are welcome!
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+Please review issues before you start work, someone may already be working on your particular bug or feature.
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+If there is no issue describing your intended contribution, please make one, and state your intention in the issue.
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+Work with the maintainers to make your contribution.
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+Make a Pull Request early to discuss your work in progress. The maintainers may want to direct your contribution towards a larger goal.
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+Have fun!