Adding missing file licenses

src/randomizer-animation.c

-/* Copyright YEAR Copyright Holder
+/* randomizer-animation.c
  *
- * Licence text goes here
+ * Copyright 2021 François Téchené
  *
- * Author: you <your@email>
+ * 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/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
+
+
 #include "randomizer-animation.h"
 #include <math.h>
 

src/randomizer-animation.h

-/* Copyright YEAR Copyright Holder
+/* randomizer-animation.h
  *
- * Licence text goes here
+ * Copyright 2021 François Téchené
  *
- * Author: you <your@email>
+ * 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/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
+
+
 #ifndef _my_app_window_h_
 #define _my_app_window_h_