[cluttermm_tutorial] actor_events example: Add a copyright header.

[Murray Cumming <murrayc src gnome org>]

commit 1cddb279a2d5fcb3d5952f99f9638e6294290a7d
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Mar 28 20:28:57 2016 +0200

    actor_events example: Add a copyright header.

 examples/actor_events/main.cc |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)
---
diff --git a/examples/actor_events/main.cc b/examples/actor_events/main.cc
index 8bcc4da..2a89c4a 100644
--- a/examples/actor_events/main.cc
+++ b/examples/actor_events/main.cc
@@ -1,7 +1,23 @@
+/*
+ * Copyright (c) 2011-2016 cluttermm developers
+ *
+ * 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
+ */
+
 #include <cluttermm.h>
 #include <iostream>
 
-
 //Define some functions for the signal handlers to call: 
 bool on_my_button_press(Clutter::ButtonEvent* event, Glib::RefPtr<Clutter::Group> g)
 {