added README
added README

lvminmin/lvminmin.github.com,Soullivaneuh/SonataGoogleAuthenticator,rande/GoogleAuthenticator,chregu/GoogleAuthenticator.php,lucanos/GoogleAuthenticator.php,scottrobertson/GoogleAuthenticator,denny0223/GoogleAuthenticator,lvminmin/lvminmin.github.com,Soullivaneuh/SonataGoogleAuthenticator,AwardWallet/GoogleAuthenticator,lvminmin/lvminmin.github.com,sonata-project/GoogleAuthenticator