Add license

Author: pascalandy

LICENSE

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+Copyright (C) 2019 pascalandy.com/blog/now OR https://twitter.com/askpascalandy OR https://github.com/pascalandy
+
+Project: https://github.com/firepress-org/FirePress_Crisply
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Read it here: https://github.com/pascalandy/GNU-GENERAL-PUBLIC-LICENSE/blob/master/LICENSE.md
+
+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.
+
+You should have received a copy of the GNU General Public License along with this program.
+Read it here https://github.com/pascalandy/GNU-GENERAL-PUBLIC-LICENSE/blob/master/LICENSE.md