Add Google Group link to README
Add Google Group link to README
nagyistoce/firebase-firepad,STRd6/firepad,gching/firepad,dipankar08/firepad,dipankar08/firepad,woutie012006/firepad,nagyistoce/firebase-firepad,woutie012006/firepad,missive/firepad,murugespandian/firepad,missive/firepad,kofifus/firepad,Unrestricted-Coding/firepad-rethinkdb,abhishekgahlot/firepad,Unrestricted-Coding/firepad-rethinkdb,gching/firepad,cben/firepad,shadowcodex/firepad-rethinkdb,STRd6/firepad,kofifus/firepad,cben/firepad,murugespandian/firepad,shadowcodex/firepad-rethinkdb,JudeMartin/firepad,cben/firepad,JudeMartin/firepad,JudeMartin/firepad,dipankar08/firepad,STRd6/firepad,abhishekgahlot/firepad