Adding Matrix room

[clonesnowv]

What this solves

This adds a way for potential new members to learn about the community and help people determine how active the community is.

Currently, Mumble and IRC doesn't provide an easy way to do this:

• Some people are introverted and prefer reading text rather than join calls.
• IRC can be difficult for new members who want to learn about Linux.
• New members may not know how to configure an IRC bouncer.
• Members cannot always keep a client connected to log messages.