Add README
Add README

Yawning/ricochet-client,paulperegud/xmpp-client,twstrike/xmpp-client,thommfullery/birdcannon,iseeareddoor/xmpp-client,kenkes/xmpp-client,isislovecruft/xocolatl,isislovecruft/xmpp-client,agl/xmpp-client