Allow guests to start a call with someone

[sim6]

Thanks for your work. A simple live chat feature would be awesome. I would like to have an URL that creates a new public chat room with a group of users.
Thanks again.

[nickvergessen]

You can create public rooms already and share the link to people you want?

What exactly is missing?

[sim6]

I would like that a guest, or a nextcloud user, could visit a page where a chat room was automatically created with a support group.

[ecc86]

similar to #674