feat：可接受 screen seg来读屏幕

src/mais4u/mais4u_chat/screen_manager.py

@@ -0,0 +1,14 @@
+class ScreenManager:
+    def __init__(self):
+        self.now_screen = str()
+        
+    def set_screen(self,screen_str:str):
+        self.now_screen = screen_str
+        
+    def get_screen(self):
+        return self.now_screen
+    
+    def get_screen_str(self):
+        return f"现在千石可乐在和你一起直播，这是他正在操作的屏幕内容：{self.now_screen}"
+
+screen_manager = ScreenManager()