Add open source stuff

Author: simison

volunteering/index.html

@@ -60,6 +60,10 @@ <h1>In the past</h1>
           <a href="http://www.liveherring.org/">LiveHerring</a> media art activism.
         </div>
       </div>
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+      <p>I'm <a href="http://github.com/simison">active</a> open source contributor. For instance <a href="http://meanjs.org/">Mean.js</a> and <a href="http://agendajs.com">Agenda</a></p>
 
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