Add license

Author: cpq

LICENSE

@@ -0,0 +1,15 @@
+Copyright (c) 2023 Cesanta Software Limited
+All rights reserved
+
+This software is dual-licensed: you can redistribute it and/or modify it under
+the terms of the GNU General Affero Public License version 3 as published by
+the Free Software Foundation. For the terms of this license, see
+https://www.gnu.org/licenses/agpl-3.0.en.html.
+
+You are free to use this software under the terms of the GNU Affero General
+Public License, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero
+General Public License for more details.
+
+Alternatively, you can license this software under a commercial license.
+out in https://mongoose.ws/licensing/.