add missing copyright/license notice

pdf/src/processing/pdf/PGraphicsPDF.java

@@ -1,3 +1,24 @@
+/*
+  Part of the Processing project - http://processing.org
+
+  Copyright (c) 2005-06 Ben Fry and Casey Reas
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+*/
+
 package processing.pdf;
 
 import java.io.*;