Hi Malte,
Thorben told me that you made some progress on your extension and you would like to add it as an Camunda community extension. As Thorben is already quite busy supervising another community project, I would like to assist you with all the help needed to setup the the extension properly. So feel to approach me any time you have an organizational question 
The next step would be to transfer your project to the Camunda organization. There are two ways to achieve that:
- I can create the repository in the Camunda organization and give you push rights. This would lose the two issues in your current repository and would not create redirects from the current repository URL to the new URL.
- To make a proper transfer including issues and redirects, the transferring user must have admin rights in the Camunda organization. Going down this route, you could transfer the repository to my personal user first (named JoHeinem) and I would then transfer it to the Camunda organization. Some details on repository transfer can be found here: https://help.github.com/articles/transferring-a-repository-owned-by-your-personal-account/
(answer is based on this post from Thorben)
Best,
Johannes