annepro2: add licence information

keyboards/annepro2/annepro2.c

@@ -1,3 +1,19 @@
+ /* Copyright 2021 OpenAnnePro community 
+  * 
+  * 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 2 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/>. 
+  */ 
+
 #include "ch.h"
 #include "hal.h"
 #include "annepro2.h"
@@ -193,4 +209,4 @@ bool OVERRIDE process_record_kb(uint16_t keycode, keyrecord_t *record) {
         }
     }
     return process_record_user(keycode, record);
-}
+}