adds game over credits (#74)

## Changes
- Adds game over credits

Reviewed-on: gymkhana/gymkhana#74
Reviewed-by: Eneko Nieto <eneko@eneko.ovh>
Co-authored-by: oier <oierbravo@gmail.com>
Co-committed-by: oier <oierbravo@gmail.com>

gymkhana/rooms/turno_cocina/creditos/RestartGameButton.gd

@@ -0,0 +1,11 @@
+extends Button
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	self.visible = false
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta):
+	if(escoria.globals_manager.get_global("turno_cocina_creditos_return_to_menu_visible")):
+		self.visible = true