added main menu and can continue from last level

scripts/main_menu.gd

@@ -0,0 +1,25 @@
+extends Node
+
+var last_scene
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	SaveLoad.load_persistent_data()
+
+func _on_continue_pressed() -> void:
+	var level
+	var load_to_gamemode
+	
+	if GameGlobals.current_level == null:
+		level = "res://scenes/HUBWORLD.tscn"
+		load_to_gamemode = "res://GameModes/hubworld.tres"
+	else:
+		level = GameGlobals.current_level
+		load_to_gamemode = GameGlobals.current_gamemode
+	
+	get_tree().change_scene_to_file(level)
+	GameGlobals.loading_gamemode = load(load_to_gamemode)
+	print("LEVEL : ",GameGlobals.current_level)
+
+func _on_exit_pressed() -> void:
+	get_tree().quit()