add some copyright notice to the progress display code

Some self patting on the back to keep my ego alive.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

progress.c

@@ -1,3 +1,13 @@
+/*
+ * Simple text-based progress display module for GIT
+ *
+ * Copyright (c) 2007 by Nicolas Pitre <nico@cam.org>
+ *
+ * This code 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.
+ */
+
 #include "git-compat-util.h"
 #include "progress.h"