Update README.md

README.md

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 # blegw
 Gateway Bluetooth LE->MQTT (now support only xiaomi scale and didn't support mqtt :-D).
+
+Project based on openScale (https://github.com/oliexdev/openScale/) code.
+
+# License
+
+Project is licensed under the GPL v3, see LICENSE file for full notice.
+
+    Copyright (C) 2014  olie.xdev <olie.xdev@googlemail.com>
+    
+    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.
+
+    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.  If not, see <http://www.gnu.org/licenses/>