integrations: Add documentation for AppFollow

templates/zerver/integrations.html

@@ -106,6 +106,50 @@
     <img class="screenshot" src="/static/images/integrations/airbrake/002.png" />
 </div>
 
+<div id="appfollow" class="integration-instructions">
+  <p>
+    Receive user reviews from your tracked apps on AppFolllow in Zulip
+    using the Zulip AppFollow plugin!
+  </p>
+
+  <p>
+    First, create the stream you'd like to use for AppFollow notifications, and
+    subscribe all interested parties to this stream. We recommend the
+    name <code>appfollow</code>.
+  </p>
+
+  <p>Next, on your {{ settings_html|safe }}, create an AppFollow bot.</p>
+
+  <p>Then, log into your account on <a href="http://appfollow.io">appfollow.io</a>, and:</p>
+
+  <ol>
+    <li>
+      <p>
+        Click on the app for which you'd like to receive reviews.
+        Click on <b>Integrations</b> and then go to the <b>Others</b> tab.
+      </p>
+
+      <img class="screenshot" src="/static/images/integrations/appfollow/001.png" />
+    </li>
+    <li>
+      <p>
+        In the Webhook URL field, enter the following URL, replacing the bot API key
+        and Zulip stream with the appropriate information.
+      </p>
+
+      <p><code>{{ external_api_uri_subdomain }}/v1/external/appfollow?api_key=<font color="#00A26F">test_api_key</font>&amp;stream=<font color="#00A26F">appfollow</font></code></p>
+    </li>
+  </ol>
+
+  <p>
+    <b>Save Changes</b> –  all done!<br />
+    New reviews for your app will be delivered to your Zulip stream.
+  </p>
+
+  <img class="screenshot" src="/static/images/integrations/appfollow/002.png" />
+</div>
+
+
 <div id="asana" class="integration-instructions">
 
     <p>Get Zulip notifications for your Asana tasks!</p>