Project organisation: Licensing, Contributions etc

[pwarren]

Figured I'd put up an issue for this.

I'd like to get a CONTRIBUTING.md file going, probably based on following https://mozillascience.github.io/working-open-workshop/contributing/

It would be a good idea to set the licensing terms for the code too, and make clear which parts are under which license (eg. GPLv2 or higher not appropriate for the shematics or gerbers, works for the code, but DSP_Lib is BSD(?) licensed, etc)

Code layout and design, I've been very impressed by the code in the mCHF repos: https://github.com/df8oe/mchf-github, which may have some ideas for us! (In particular, I'm struggling with how to add FM mod/demod, including subaudible tones etc It's not clear to me from the current code, which may say more about me than the code!)

[jeffersonbenson]

#15 seems to be accomplishing this, pending any necessary changes.