There is a first release available now via Hubitat Package Manager or you can manually install from GitHub - bsileo/Hubitat_RainMachine: Integrate SmartThings with RainMachine. i have not done any cleanup on documentation and still have some code to clear-up from the old smartThings side, but it seems to work for me.
Shout out to BRBeaird for doing all the real work here from his original repo.
