Create CONTRIBUTING.md

CONTRIBUTING.md

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+Contributing
+============
+
+👍🎉 Thanks a lot for considering contributing 🎉👍
+
+We welcome and encourage contribution. There is many way to contribute: you can
+write bug report, contribute code or documentation.
+You can also go to the [bitcraze forum](https://forum.bitcraze.io) and help others.
+
+## Reporting issues
+
+When reporting issues the more information you can supply the better.
+
+ - **Information about the environment:**
+   - What version of the firmware are you running
+   - If relevant, what are you using to control the Crazyflie. ie. What lib or client, and what version.
+ - **How to reproduce the issue:** Step-by-step guide on how the issue can be reproduced (or at least how you reproduce it).
+ Include everything you think might be useful, the more information the better.
+
+## Improvements request and proposal
+
+We and the community are continuously working to improve the firmware.
+Feel free to make an issue to request a new functionality.
+
+## Contributing code/Pull-Request
+
+We welcome code contribution, this can be done by starting a pull-request.
+
+If the change is big, typically if the change span to more than one file, consider starting an issue first to discuss the improvement.
+This will makes it much easier to make the change fit well into the firmware.
+
+There is some basic requirement for us to merge a pull request:
+ - Describe the change
+ - Refer to any issues it effects
+ - Separate one pull request per functionality: if you start writing "and" in the feature description consider if it could be separated in two pull requests.
+ - The pull request must pass the automated test (see test section bellow)
+
+In your code:
+ - 2 spaces indentation
+ - Make sure the coding style of your code follows the style of the file.
+
+### Run test
+
+In order to run the tests you can run:
+```
+./tools/build/build
+```