Docs and license

• Add GPLv3 license to the Arduino and MATLAB code
• Lots of readmes
• Upload the grabber CAD files

4DrobotServer/4DrobotServer.ino

@@ -13,6 +13,13 @@
  * Inspired by PositionGaugeServer, also in use at CLEAR.
  */
 
+/* 
+ * This file is part of 4DrobotServer.
+ * 4DrobotServer 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.
+ * 4DrobotServer 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 4DrobotServer. If not, see <https://www.gnu.org/licenses/>. 
+ */
+
 #include <Arduino.h>
 
 #include <SPI.h>