Create an "Experimental" section.

PiperOrigin-RevId: 173277159
diff --git a/site/_layouts/documentation.html b/site/_layouts/documentation.html
index 9133a99..bec68a5 100644
--- a/site/_layouts/documentation.html
+++ b/site/_layouts/documentation.html
@@ -166,6 +166,11 @@
               <li><a href="/versions/{{ site.version }}/skylark/lib/skylark-overview.html">Reference</a></li>
               <li><a href="/versions/{{ site.version }}/skylark/language.html">Language</a></li>
             </ul>
+            <h3>Experimental</h3>
+            <ul class="sidebar-nav">
+              <li><a href="/versions/{{ site.version }}/experimental.html">About experimental features</a></li>
+              <li><a href="/versions/{{ site.version }}/migrate-cocoapopds.html">Converting CocoaPods dependencies</a></li>
+            </ul>
           </nav>
         </div>
         <div class="col-lg-9">
diff --git a/site/docs/experimental.md b/site/docs/experimental.md
new file mode 100644
index 0000000..0474285
--- /dev/null
+++ b/site/docs/experimental.md
@@ -0,0 +1,12 @@
+---
+layout: documentation
+title: Experimental
+---
+
+# Experimental
+
+This section contains documentation for Bazel features and workflows that are
+considered useful, but have not been fully verified and are not officially
+supported.
+
+*  [Converting CocoaPods dependencies](migrate-cocoapods.html)