Adding Zulip information

Author: warthog9

index.html

@@ -69,6 +69,8 @@ <h2>Getting in Touch</h2>
 <li>Stop by #python-gsoc on irc.freenode.net to chat and ask questions in
 realtime.  </li>
 
+<li>If you are uncomfortable with IRC, you may try our Zulip instance at <a href="https://zulip.python-gsoc.org">https://zulip.python-gsoc.org</a>.  We are working on IRC integration, but for now they are two separate instances so please be aware of that.</li>
+
 <li>Found a typo?  Want to improve this page? <a
 href="https://github.com/python-gsoc/python-gsoc.github.io">The source code
 is on GitHub and we welcome pull requests!</a></li>