Add usernames to forum description when public group

[jluerken]

Hi,

I want to see a mod here that does the following:

I created a public group and a forum where this public group has access to.
In the forum description I want to have the list of usernames of all users which are in this public group.

That means if the group leader allows a user to join his group the name of the member should be added to the description and removed again when he left the group.

Regards
jluerken