Add GPLv3 header.

NCPCompatBukkit/src/main/java/fr/neatmonster/nocheatplus/compat/bukkit/model/BukkitDirectionalCentered.java

@@ -1,3 +1,17 @@
+/*
+ * 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/>.
+ */
 package fr.neatmonster.nocheatplus.compat.bukkit.model;
 
 import org.bukkit.block.BlockFace;