Add client-data page

tutorial/index.html

@@ -181,6 +181,9 @@ hljs.initHighlightingOnLoad();
    <li>
       <a target="_self" href="#scoping">Scoping</a>
    </li>
+   <li>
+      <a target="_self" href="#client-data">Client Data</a>
+   </li>
    <li class="nav-header">Understanding Reactivity</li>
    <li>
       <a target="_self" href="#reactivity-overview">Reactivity Overview</a>
@@ -334,6 +337,14 @@ hljs.initHighlightingOnLoad();
 
 </div>
 
+<!-- Client Data -->
+<div class="tab-pane" id="client-data">
+
+{% capture client_data %}{% include tutorial/client-data.md %}{% endcapture %}
+{{ client_data | markdownify }}
+
+</div>
+
 <!-- Reactivity Overview -->
 <div class="tab-pane" id="reactivity-overview">