Badge request: IRC channel name + user count

I'm not sure exactly what shields is, but this seems like a nice place to find out if anyone has already thought of / implemented this idea:

I'd like a shield that displays the IRC channel of my project, and tells the number of people that are currently in the channel. I think that would make it more likely for people to want to join and chat if they see that the room is not empty.

No files, tests, or entry points are named. Start by understanding how Shields defines badge integrations and whether an IRC source can reliably provide the channel name and current user count. Done means a specified, working badge with documented behavior and appropriate tests.

Written by the indexing model from the issue text.