Add LICENSE file.

Author: niemeyer

LICENSE

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+This software is licensed under the LGPLv3, included below.
+
+As a special exception to the GNU Lesser General Public License version 3
+("LGPL3"), the copyright holders of this Library give you permission to
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+Except as stated in this special exception, the provisions of LGPL3 will
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+
+
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
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+  0. Additional Definitions.
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+  As used herein, "this License" refers to version 3 of the GNU Lesser
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