Add WeScheme link

index.html

@@ -97,6 +97,7 @@
       <li><a href="http://www.sourcelair.com/">sourceLair</a> (online IDE)</li>
       <li><a href="http://eloquentjavascript.net/chapter1.html">Eloquent JavaScript</a> (book)</a></li>
       <li><a href="http://www.mergely.com/">Mergely</a> (interactive diffing)</li>
+      <li><a href="http://www.wescheme.org/">WeScheme</a> (learning tool)</li>
      </ul>
 
   </div></div>