add irc and twitter links to readme
add irc and twitter links to readme

jimyx17/gmusic,TheOpenDevProject/gmusicapi,peetahzee/Unofficial-Google-Music-API,simon-weber/gmusicapi,tanhaiwang/gmusicapi,nvbn/Unofficial-Google-Music-API,dvirtz/gmusicapi,thebigmunch/gmusicapi,dvirtz/gmusicapi,simon-weber/Unofficial-Google-Music-API