Protect master branch

Dear Maintainer,

2 requests:

1. Please protect the master branch of this Librem5 repository by making it update by pull request only. Doing so forces us to work on other branches (should be doing this already) and make pull requests to get changes onto master.

To protect the master branch: Settings -> Branches -> Protected Branches -> master -> check both boxes

2. Please add a .doap file to the root of this repo. You can copy libhandy.doap from https://code.puri.sm/adrien.plazas/libhandy/src/master/libhandy.doap to use as an example and be sure to update it's contents to reflect the maintainer-ship of this repo. Multiple names may be listed (as in libhandy.doap). You should do this on your forks as well.

Thanks for being awesome.