Add license document

LICENSE.txt

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+These programs are free software. They come without any warranty, to
+the extent permitted by applicable law. You can redistribute them
+and/or modify them under the terms of the Do What The Fuck You Want
+To Public License, Version 2, as published by Sam Hocevar and 
+reproduced below.
+
+DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
+Version 2, December 2004 
+
+Copyright (C) 2004 Sam Hocevar <[email protected]> 
+
+	Everyone is permitted to copy and distribute verbatim or modified 
+	copies of this license document, and changing it is allowed as long 
+	as the name is changed. 
+
+DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
+TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 
+
+	0. You just DO WHAT THE FUCK YOU WANT TO.