ADD settings menu to main game with go back feature

controllers/gui_controller.py

@@ -1,9 +1,14 @@
 from render.gui_renderer import GUIRenderer
 
 class GUIController:
-    def __init__(self, gui_renderer: GUIRenderer):
+    def __init__(self, gui_renderer: GUIRenderer, callback_function):
+        self.callback_function = callback_function
+
         self.gui_renderer = gui_renderer
         self.slider =  gui_renderer.slider
+        self.settings_button = gui_renderer.settings_button
+        self.settings_button.set_action(lambda: self.callback_function("settings_menu"))
 
     def update(self, event):
-        self.slider.handle_event(event)
+        self.slider.handle_event(event)
+        self.settings_button.handle_event(event)