Create CONTRIBUTING.md

Author: amisolution

CONTRIBUTING.md

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+# Contributing
+
+## Issues
+
+We use GitHub issues to track public bugs. Please ensure your description is clear and has sufficient instructions to be able to reproduce the issue.
+
+## Pull Requests
+
+* Fork the repo and create your branch from master.
+* If you've added code that should be tested, add tests.
+* Ensure the test suite passes.
+
+## Coding Style
+
+* Avoid abbreviations.
+* TODO comments should indicate the responsible person (e.g. `// TODO(john): comment goes here`)
+* For the sake of simplicity, we're using only TODO comments, no FIXMEs, etc.