More detailed contributions guide

[bnord]

This is what we developed for DeepBench

https://github.com/deepskies/DeepBench/blob/929463b03a8a026c8cc0bccb4b07e425fc62f744/CONTRIBUTING.md#L4

[voetberg]

I have one that is """"general"""" for deepskies in the org-wide hub. It's linked in the newest deepbench. https://github.com/deepskies/.github/blob/main/CONTRIBUTING.md ; It can be adapted for this repo as well (or just linked as is)

[bnord]

Yeah, I think either of those solutions would be good.