Add a copyright notice which includes an extra permission for linking with OpenSSL

Signed-off-by: Francois Marier <francois@catalyst.net.nz>

README

@@ -24,3 +24,34 @@ here:
   https://eduforge.org/docman/view.php/176/3200/Mahoodle.pdf
 
   -- the Mahara Development Team
+
+
+Copyright notice
+----------------
+
+Copyright (C) 2006, 2007, 2008, 2009, 2010 Catalyst IT Ltd and others;
+see: http://wiki.mahara.org/Contributors
+
+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/>.
+
+Additional permission under GNU GPL version 3 section 7:
+
+If you modify this program, or any covered work, by linking or
+combining it with the OpenSSL project's OpenSSL library (or a
+modified version of that library), containing parts covered by the
+terms of the OpenSSL or SSLeay licenses, the Mahara copyright holders
+grant you additional permission to convey the resulting work.
+Corresponding Source for a non-source form of such a combination
+shall include the source code for the parts of OpenSSL used as well
+as that of the covered work.