Add LICENSE.md

closes #158

LICENSE.md

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+Copyright (c) 2009-2016 Marco Peereboom <marco@peereboom.us>
+Copyright (c) 2009-2011 Ryan McBride <mcbride@countersiege.com>
+Copyright (c) 2009 Darrin Chandler <dwchandler@stilyagin.com>
+Copyright (c) 2009 Pierre-Yves Ritschard <pyr@spootnik.org>
+Copyright (c) 2010 Tuukka Kataja <stuge@xor.fi>
+Copyright (c) 2011 Jason L. Wright <jason@thought.net>
+Copyright (c) 2011-2016 Reginald Kennedy <rk@rejii.com>
+Copyright (c) 2011-2012 Lawrence Teo <lteo@lteo.net>
+Copyright (c) 2011-2012 Tiago Cunha <tcunha@gmx.com>
+Copyright (c) 2012-2015 David Hill <dhill@mindcry.org>
+Copyright (c) 2014-2016 Yuri D'Elia <yuri.delia@eurac.edu>
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.