Add doors

mods/doors/README.txt

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+Minetest 0.4 mod: doors
+========================
+
+License of source code:
+-----------------------
+Original license text:
+--    (c) 2011 Fernando Zapata
+--    Code licensed under GNU GPLv3
+--    Content licensed under CC BY-SA 3.0
+--    2012-01-08    11:03:57
+
+There has been unsuccesful attempts to contact the original author. Thus,
+based on the intentions of the author, it is assumed that this code is
+distributable and modifiable under GPLv2+later, under which Minetest is
+distributed.
+
+Modifications:
+  Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+http://www.gnu.org/licenses/gpl-2.0.html
+
+License of media (textures and sounds)
+--------------------------------------
+Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)                                 
+http://creativecommons.org/licenses/by-sa/3.0/
+
+Authors of media files
+-----------------------
+Everything not listed in here:
+Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+From the original zlpdoors mod by Fernando Zapata:
+  door_wood_a.png
+  door_wood_a_r.png
+  door_wood_b.png
+  door_wood_b_r.png
+  door_wood.png
+