add readme
add readme

ETENG-OSP/xgpush-cordova,ETENG-OSP/xgpush-cordova,JrontEnd/xgpush-cordova,JrontEnd/xgpush-cordova,471685249/xgpush-cordova,gengen1988/xgpush-cordova,471685249/xgpush-cordova,471685249/xgpush-cordova,gengen1988/xgpush-cordova,gengen1988/xgpush-cordova,ETENG-OSP/xgpush-cordova,gengen1988/xgpush-cordova,471685249/xgpush-cordova,JrontEnd/xgpush-cordova,ETENG-OSP/xgpush-cordova,JrontEnd/xgpush-cordova