Add Copy of License

LICENSE.txt

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+Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
+(https://creativecommons.org/licenses/by-nc-sa/4.0/)
+------------------------------------------------------------------------
+
+This is a human-readable summary of (and not a substitute for) the license.
+(https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode)
+
+You are free to:
+
+    Share — copy and redistribute the material in any medium or format
+    Adapt — remix, transform, and build upon the material
+
+    The licensor cannot revoke these freedoms as long as you follow the license terms.
+
+Under the following terms:
+
+    Attribution — You must give appropriate credit, provide a link to the license,
+    and indicate if changes were made. You may do so in any reasonable manner, but
+    not in any way that suggests the licensor endorses you or your use.
+
+    NonCommercial — You may not use the material for commercial purposes.
+
+    ShareAlike — If you remix, transform, or build upon the material, you must
+    distribute your contributions under the same license as the original.
+
+    No additional restrictions — You may not apply legal terms or technological
+    measures that legally restrict others from doing anything the license permits.
+
+Notices:
+
+    You do not have to comply with the license for elements of the material in the
+    public domain or where your use is permitted by an applicable exception or limitation.
+
+    No warranties are given. The license may not give you all of the permissions necessary
+    for your intended use. For example, other rights such as publicity, privacy, or moral
+    rights may limit how you use the material.