public void AddAiPlayer(Vector2 position, IMoveableObject target, float difficulty = 1.0f)
{
GameObject model = GameObject.Instantiate(PaddleModel, new Vector3(position.x, position.y), Quaternion.identity);
AiPlayer player = model.AddComponent <AiPlayer>();
player.SetTarget(target);
player.SetSpeed(8.0f);
player.SetDifficulty(difficulty);
Players.Add(player);
}