Credits have been added.
Level2 has been added to LevelSelectScene
Unused buttons have been hidden from the MenuInicio
SegundoNivel has been added to the code.
TileMap has been modified so it knows when to change to another level.

LevelDoor graphic has been re-sized.
Changes int the TileMaps folder have been done (unused files have been deleted and a typo in one files name has been fixed)