There's no specific code of conduct yet, but you can follow the usual one:
- Be gentle
- Be supportive
- All kind of contributions are welcomed ;) (code, issues, troubleshooting, PRs, docs, etc.)
If you want to contribute with code that means you've probably found and issue, so you can proceed to create it and then label it as an enhance, bugfix or as a desired functionality.
That's pretty much all there is to it!