Create readme.txt

readme.txt

+Columnia (2014 by Glunggi) is a Fork of Stairs ..in principle is its Stairs with other Nodes.
+So i will to keep the old Stairs- Licenses for this chanced Mode.. include all of my Chances.
+
+Minetest 0.4 mod: stairs
+=========================
+
+License of source code:
+-----------------------
+Copyright (C) 2011-2012 Kahrl <kahrl@gmx.net>
+Copyright (C) 2011-2012 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 Lesser 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/lgpl-2.1.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>