README: Add link to contribution.md
@ -21,7 +21,8 @@ Please refer to the [user documentation](https://pixhawk.org/users/start) for fl
### Developers ###
Contributing guide:
http://px4.io/dev/contributing
* [CONTRIBUTING.md](https://github.com/PX4/Firmware/blob/master/CONTRIBUTING.md)
* [PX4 Contribution Guide](http://px4.io/dev/contributing)
Developer guide:
http://px4.io/dev/