9f5a323e06
We currently only have a very brief outline of the commit message conventions in the README. Improve on that by splitting out the relevant section into a separate file that outlines all conventions we use in addition to the general guidelines in the [handbook]. [handbook]: https://handbook.gnome.org/development/commit-messages.html Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3122>