Add license.

README.md

@@ -0,0 +1,8 @@
+# arduboy-shooter
+
+## License
+
+Copyright 2017 Alex Margarit (alex@alxm.org)
+
+* Code licensed under [GNU GPL3](https://www.gnu.org/licenses/gpl.html) (see `COPYING`)
+* Graphics licensed under [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (see `CC-BY-NC-ND`)

src/loop.c

@@ -1,3 +1,20 @@
+/*
+    Copyright 2017 Alex Margarit <alex@alxm.org>
+
+    arduboy-shooter 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.
+
+    arduboy-shooter 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 arduboy-shooter.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #include "shared.h"
 
 #define NUM_STARS 24

src/loop.h

@@ -1,3 +1,20 @@
+/*
+    Copyright 2017 Alex Margarit <alex@alxm.org>
+
+    arduboy-shooter 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.
+
+    arduboy-shooter 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 arduboy-shooter.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #ifdef __cplusplus
 extern "C" {
 #endif

src/main.c

@@ -1,3 +1,20 @@
+/*
+    Copyright 2017 Alex Margarit <alex@alxm.org>
+
+    arduboy-shooter 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.
+
+    arduboy-shooter 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 arduboy-shooter.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #ifndef ARDUINO
 
 #include <a2x.h>

src/shared.c

@@ -1,3 +1,20 @@
+/*
+    Copyright 2017 Alex Margarit <alex@alxm.org>
+
+    arduboy-shooter 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.
+
+    arduboy-shooter 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 arduboy-shooter.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #ifndef ARDUINO
 
 #include <a2x.h>

src/shared.cpp

@@ -1,3 +1,20 @@
+/*
+    Copyright 2017 Alex Margarit <alex@alxm.org>
+
+    arduboy-shooter 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.
+
+    arduboy-shooter 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 arduboy-shooter.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #include <Arduino.h>
 #include <Arduboy2.h>
 #include "shared.h"

src/shared.h

@@ -1,3 +1,20 @@
+/*
+    Copyright 2017 Alex Margarit <alex@alxm.org>
+
+    arduboy-shooter 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.
+
+    arduboy-shooter 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 arduboy-shooter.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #ifdef ARDUINO
     #include <stdlib.h>
     #include <stdbool.h>

src/src.ino

@@ -1,3 +1,20 @@
+/*
+    Copyright 2017 Alex Margarit <alex@alxm.org>
+
+    arduboy-shooter 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.
+
+    arduboy-shooter 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 arduboy-shooter.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #include <Arduino.h>
 #include <Arduboy2.h>
 #include "shared.h"