private void WindowKeyDown(object sender, KeyEventArgs e) // handling pressing keys, for moving your hero around
        {
            if (e.Key == Key.Left)
            {
                hero.Left();
            }

            if (e.Key == Key.Right)
            {
                hero.Right();
            }

            if (e.Key == Key.Up)
            {
                hero.Up();
            }

            if (e.Key == Key.Down)
            {
                hero.Down();
            }
        }