If you have a bug using Contentz please report it opening an issue.
If you find a bug and wants to fix it report it first and then indicate with a comment you are going to fix it. Then send a a Pull Request with the fix and the message Fix #123 where 123 is the bug report issue number.
If you want a certain feature on Contentz please ask it opening an issue.
Note I'm not going to work on every possible feature request.
If you want to work on a feature comment the issue of the said feature and then send a Pull Request with the feature code and the message Resolves #123 where 123 is the feature request issue number.