Create CONTRIBUTING.md

CONTRIBUTING.md

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+##Contributing Guidelines
+
+Wanna contribute to this project? Yay, here is how!
+
+###Filing Issues
+
+If you have a question about this project, or have problems using it, please read the README before filing an issue. Also, double-check with the current issues on our [Issues Tracker](https://github.com/zalando/clair-sqs/issues).
+
+###Contributing a Pull Request
+
+1. Submit a comment to the relevant issue or create a new issue describing your proposed change.
+2. Do a fork, develop and test your code changes.
+3. Include documentation.
+4. Submit a pull request.
+
+You'll get feedback about your pull request as soon as possible.
+
+Happy hacking ;-)