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 the lib are you using
+ - **What is the issue:** A clear explaination of what whas the expected behavior and what is the observed behavior can
+   often help a lot.
+
+## Improvements request and proposal
+
+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 lib.
+
+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.
+ - Specify if the change affects the Arduino boards on which the lib can run(ie. are you adding a board-specific functionality).
+
+In your code:
+ - 2 spaces indentation
+ - Make sure the coding style of your code follows the style of the file.
+