Create license.txt

license.txt

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+Open Waters License (GNU GPL v3)
+
+Open Waters is free software: you can redistribute it and/or modify it under 
+the terms of the GNU General Public License v3 as published by the Free Software 
+Foundation, either version 3 or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but without any 
+warranty; without even the implied warranty of merchantability or fitness for a 
+particular purpose. See the GNU General Public License for more details. See 
+here for a complete text of the license terms:
+
+http://www.gnu.org/licenses/gpl.txt