Invite @telegrambot:polychat.de into the room. (i hope it joins automatically)
within the subroom activate the bridge
create [type] - Create a Telegram chat of the given type for the current Matrix room. The type is either group, supergroup or channel (defaults to supergroup).
and get the invitelinks for the remote room and store it. That will be used for the next user to join the remote-room
invite-link [--uses=] [--expire=<time delta, e.g. 1d>] [--request-needed] -- [title] - Get a Telegram invite link to the current chat.
Create a Sub room: