add missing ferry vehicle desc

src/vehicles/Ferry.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include "Vehicle.h"
+#include "Door.h"
+
+enum eFerryNodes
+{
+	FERRY_DOOR_FRONT = 1,
+	FERRY_RAMP_FRONT,
+	FERRY_DOOR_BACK,
+	FERRY_RAMP_BACK,
+	NUM_FERRY_NODES
+};