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/scrollingText.gd

@@ -0,0 +1,14 @@
+extends VBoxContainer
+
+signal finished
+
+func _ready():
+	pass # Replace with function body.
+
+func _process(delta):
+	var size = self.get_global_rect().size
+	if escoria.globals_manager.get_global("turno_credits_rolling"):
+		self.set_position(self.get_position() + Vector2(0, -1))
+	if self.get_position().y < 0 - size.y:
+		escoria.globals_manager.set_global("turno_credits_rolling", false)
+		emit_signal("finished")