check long press on touch screen

check long press.cs

	bool CheckForLongPress() {
		if (Input.touches[0].phase == TouchPhase.Began) { // If the user puts her finger on screen...
			_timePressed = Time.time - _timeLastPress;
		}

		if (Input.touches[0].phase == TouchPhase.Ended) { // If the user raises her finger from screen
			_timeLastPress = Time.time;
			if (_timePressed > WaitingSeconds/2f) { // Is the time pressed greater than our time delay threshold?
				return true;
			}
		}
		return false;
	}