Add participant button

[lebaudantoine]

Feature Request

Is your feature request related to a problem or unsupported use case? Please describe.
No clear way to invite additional participants during a meeting. Missing standard "Add Participant" functionality found in GMeet and Jitsi.

Describe the solution you'd like

• Add "Invite Participant" button in participant list
• Initial phase: Available to all users
• Future state: Restrict to moderators for private/moderated rooms

[Moustique82]

the functionality of adding participants is not simple in webrtc.
the easiest solution is to add a button which displays an invitation template with the connection methods (webrtc, sip, telephone, etc.).
and a button to copy this template to share it by email or chat