Create LICENSE.txt

LICENSE.txt

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+		     PUBLIC DOMAIN NOTICE
+     National Center for Advancing Translational Sciences
+
+This software/database is a "United States Government Work" under the
+terms of the United States Copyright Act. It was written as part of the
+author's official duties as United States Government employee and thus
+cannot be copyrighted. This software is freely available to the public
+for use. The National Center for Advancing Translational Science (NCATS)
+and the U.S. Government have not placed any restriction on its use or
+reproduction.  Although all reasonable efforts have been taken to ensure
+the accuracy and reliability of the software and data, the NCATS and the
+U.S. Government do not and cannot warrant the performance or results
+that may be obtained by using this software or data. The NCATS and the
+U.S.  Government disclaim all warranties, express or implied, including
+warranties of performance, merchantability or fitness for any particular
+purpose.  Please cite the authors in any work or product based on this
+material.