Added LGPL license

While the program is already licensed under LGPL, adding into the
program file itself to be clear.

Arduino/LEDstream_FastLED/LEDstream_FastLED.ino

@@ -4,6 +4,21 @@
  * library (http://fastled.io) for driving led strips.
  * 
  * http://github.com/dmadison/Adalight-FastLED
+ *
+ * --------------------------------------------------------------------
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * --------------------------------------------------------------------
  */
 
 // --- General Settings