Description of the Bug Report

CONTRIBUTING,md currently only covers how to setup dev environment.

It would be great to get an overhaul so it actually explains how someone can contribute to DJA.

Following areas come to mind:

• Work on documentation
• Answer questions in our discussions
• Report a bug
• Submit a PR
• Write blog posts
• and more

We could use the DRF contribution guidelines as inspiration.

It would be great if someone could have a look at this and come up with a draft.

Checklist

• Certain that this is a bug (if unsure or you have a question use discussions instead)
• Code snippet or unit test added to reproduce bug