The DB Operator creates databases and make them available in the cluster via Custom Resources.
You can find documentation here: https://db-operator.github.io/documentation/
It's quite a small project, and we don't have an established way to become a contributor.
If you would like to contribute, you can go to any Github Projects and pick any issues in the Ready column. Github Projects can be found here: https://github.com/orgs/db-operator/projects
If you feel like you want to support the project in a long-term, write an email to iam@allanger.xyz, and you'll be added to the Contributors team. It would let you write to the repo without forking it.