add group icon
add group icon

iOSBIGDay/iOS.Big.Day.Communication.High.Bige.Group,iOSBIGDay/iOS.Big.Day.Communication.High.Bige.Group,iOSBIGDay/iOS.Big.Day.Communication.High.Bige.Group,iOSBIGDay/iOS.Big.Day.Communication.High.Bige.Group