added pause menu

scripts/pause_menu.gd

@@ -0,0 +1,20 @@
+extends Control
+
+@onready var level_control = get_tree().current_scene
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	visible = false
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass
+
+
+func _on_resume_pressed() -> void:
+	level_control.pause_menu()
+
+
+func _on_save__quit_pressed() -> void:
+	level_control.save_quit()