add label doc to site

examples/index.html

@@ -235,6 +235,28 @@ $('#disable-switch').switch('toggleActivation');
 </pre>
         </div>
     </div>
+<div class="row-fluid">
+        <div class="span12">
+            <h3>Label</h3>
+            <hr>
+        </div>
+    </div>
+    <div class="row-fluid">
+
+        <div class="span4">
+            <div class="switch" data-on-label="SI" data-off-label="NO">
+                <input type="checkbox" checked="checked">
+            </div>
+        </div>
+        <div class="span8">
+
+            <h4>Html:</h4>
+<pre class="prettyprint linenums">
+&lt;div class="switch" data-on-label="SI" data-off-label="NO">
+    &lt;input type="checkbox" checked="checked">
+&lt;/div></pre>
+        </div>
+    </div>
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