Could you make a “course” and simply add a forum widget?

The course could simply be called “Group Chat” or something and you could put up a training material HTML page outlining the rules.

Not sure if that meets the needs of your use case or not but . . .

That is the idea I was going to pitch.  Figured it was worth seeing if anyone had a better option. Was hoping to find something that was more visible on the page rather than having to open something to see it.