Add "projects using hangups" section to readme
Add "projects using hangups" section to readme

jodizzle/hangups,j16sdiz/hangups,ddboline/hangups,hangoutsbot/hangups,tdryer/hangups,baskervald/hangups,AshenDrops/hangups,das7pad/hangups,dxd132630/hangups,taigrr/hangups