add game menu

core/game_state/game_state.gd

@@ -1,5 +1,12 @@
 extends Node
 
+@warning_ignore("unused_signal")
+signal on_game_paused
+@warning_ignore("unused_signal")
+signal on_game_resumed
+@warning_ignore("unused_signal")
+signal on_photo_highlighted(teture: Texture)
+
 const SAVE_PATH: String = "user://savegame.json"
 
 var save_data: SaveGameData = SaveGameData.new()
@@ -30,3 +37,12 @@ func load_game() -> void:
 		save_data = SaveGameData.from_dictionary(json.data)
 	
 	is_loaded = true
+
+func pause_game() -> void:
+	get_tree().paused = true
+
+func resume_game() -> void:
+	get_tree().paused = false
+
+func quit_game() -> void:
+	get_tree().quit()