[leshan-dev] Contributing guide

[Julien Vermillard <jvermillard@xxxxxxxxx>]

Hi,

with the move to Eclipse the rules for contributing changed:

https://github.com/eclipse/leshan/blob/master/CONTRIBUTING.md

Feel free to comment, or improve this guide (I just borrowed it from the vert.x project).

And by the way the code is still frozen, we are waiting the agreement for Eclipse for the third party dependencies we are using.

Julien