Add license (just in case)

LICENSE.txt

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+CC0 1.0 Universal
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
+exclusive Copyright and Related Rights (defined below) upon the creator and
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+For these and/or other purposes and motivations, and without any expectation
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+Copyright and Related Rights in the Work and the meaning and intended legal
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+1. Copyright and Related Rights. A Work made available under CC0 may be
+protected by copyright and related or neighboring rights ("Copyright and
+Related Rights"). Copyright and Related Rights include, but are not limited
+to, the following:
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+  i. the right to reproduce, adapt, distribute, perform, display, communicate,
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+  ii. moral rights retained by the original author(s) and/or performer(s);
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+  European Parliament and of the Council of 11 March 1996 on the legal
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+  vii. other similar, equivalent or corresponding rights throughout the world
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+2. Waiver. To the greatest extent permitted by, but not in contravention of,
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+unconditionally waives, abandons, and surrenders all of Affirmer's Copyright
+and Related Rights and associated claims and causes of action, whether now
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+any other legal or equitable action to disrupt the quiet enjoyment of the Work
+by the public as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason be
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+non transferable, non sublicensable, non exclusive, irrevocable and
+unconditional license to exercise Affirmer's Copyright and Related Rights in
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+provided by applicable law or treaty (including future time extensions), (iii)
+in any current or future medium and for any number of copies, and (iv) for any
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+of the date CC0 was applied by Affirmer to the Work. Should any part of the
+License for any reason be judged legally invalid or ineffective under
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+Copyright and Related Rights in the Work or (ii) assert any associated claims
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+Affirmer's express Statement of Purpose.
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+4. Limitations and Disclaimers.
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+<http://creativecommons.org/publicdomain/zero/1.0/>