Hi,
A lot of people contribute in communities via github these days. We
should add a CONTRIBUTING.md that explains how to do so, given that we
don't use github. That's shown automatically when doing a pull requests
etc.
I think it's also a good idea to have it in the source tree independent
of github, it's very hard to figure out where to start from a git
clone / tarball.
Greetings,
Andres Freund