Document some things that should be helpful to at least new contributors. Since we don't have a way to show this when people are creating MRs, also copy over the next to a merge request template so that creates a dropdown that folks might look at when creating an MR.
Part-of:
28f646fd8 doc: Add some contributor guidelines
.gitlab/merge_request_templates/Guidelines.md | 67 +++++++++++++++++++++++++++
CONTRIBUTING.md | 67 +++++++++++++++++++++++++++
2 files changed, 134 insertions(+)
Upstream: cgit.freedesktop.org