Added settings for volume and mouse mode

Settings.gd

@@ -0,0 +1,19 @@
+extends Node2D
+
+func _ready() -> void:
+	$VBoxContainer/HBoxContainer/LeftPanel/Relative.button_pressed = Global.relative_mouse
+	$VBoxContainer/HBoxContainer/LeftPanel/Absolute.button_pressed = !Global.relative_mouse
+	$VBoxContainer/HBoxContainer/RightPanel/Volume.set_value_no_signal(Global.volume)
+
+func _on_relative_pressed() -> void:
+	Global.relative_mouse = true
+
+func _on_absolute_pressed() -> void:
+	Global.relative_mouse = false
+
+func _on_exit_pressed() -> void:
+	get_tree().change_scene_to_file("res://Intro.tscn")
+
+func _on_volume_drag_ended(value_changed: bool) -> void:
+	Global.volume = $VBoxContainer/HBoxContainer/RightPanel/Volume.value
+	$Boink.play()