docs: Initial commit on how to join Badges community
This commit creates a new page in our docs site about how to get
involved and join the Fedora Badges community. It includes some basic
instructions like how to register a FAS account, sign up to the mailing
list, join the IRC/Telegram, etc.
Once published, the page will be available here:
Signed-off-by: Justin W. Flory <firstname.lastname@example.org>