Added license document

Author: splorp

LICENSE.md

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+LICENSE
+=======
+
+This work is licensed under the [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](http://creativecommons.org/licenses/by-nc-sa/4.0/).
+
+You can also request a copy of this license by sending a letter to:
+
+Creative Commons
+444 Castro Street
+Suite 900
+Mountain View, CA
+94041
+USA