添加雨滴特效，已有基本效果，待完善

start.py

@@ -13,8 +13,11 @@ class Game:
         size = (GameConfig.window_x, GameConfig.window_y)
         self.screen = pygame.display.set_mode(size, pygame.NOFRAME)
 
+        # 设置计时器
+        self.clock = pygame.time.Clock()
+
         # 当前场景
-        self.scene = MainMenuScene(self.screen)
+        self.scene = MainMenuScene(self.screen, self.clock)
 
         # 运行循环
         self.running = True