add copyright info

app/src/processing/app/About.java

@@ -1,3 +1,25 @@
+/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */
+
+/*
+  Part of the Processing project - http://processing.org
+
+  Copyright (c) 2012-15 The Processing Foundation
+  Copyright (c) 2004-12 Ben Fry and Casey Reas
+
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License
+  version 2, as published by the Free Software Foundation.
+
+  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, write to the Free Software Foundation,
+  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
 package processing.app;
 
 import java.awt.Color;