Add GPL text

c328.h

@@ -1,3 +1,11 @@
+/* hadie - High Altitude Balloon flight software              */
+/*============================================================*/
+/* Copyright (C)2010 Philip Heron <phil@sanslogic.co.uk>      */
+/*                                                            */
+/* This program is distributed under the terms of the GNU     */
+/* General Public License, version 2. You may use, modify,    */
+/* and redistribute it under the terms of this license. A     */
+/* copy should be included with this source.                  */
 
 #ifndef INC_C328_H
 #define INC_C328_H