Adds a nice tutorial for the PagerTree integration

templates/integrations/add_pagertree.html

@@ -13,6 +13,53 @@
       you can set up {% site_name %} to create a PagerTree incident when
       a check goes down, and resolve it when a check goes back up.</p>
 
+      <h2>Setup Guide</h2>
+
+      <div class="row ai-step">
+        <div class="col-sm-6">
+            <span class="step-no">1</span>
+            <p>
+                Log into your PagerTree account, select the team you wish to add this integration to. Click the <strong>Integrations</strong> tab. Then click the <strong>+ Integration</strong> button.
+            </p>
+        </div>
+        <div class="col-sm-6">
+            <img
+                class="ai-guide-screenshot"
+                alt="Click create integration button"
+                src="{% static 'img/integrations/setup_pagertree_1.png' %}">
+        </div>
+      </div>
+
+      <div class="row ai-step">
+          <div class="col-sm-6">
+              <span class="step-no">2</span>
+              <p>
+                  In the Create Integration Form, fill out the details with apprpriate values, but most importantly make sure the <strong>Integration Type</strong> is set to <strong>Healthchecks.io</strong>. Then click the <strong>Create</strong> button.
+              </p>
+          </div>
+          <div class="col-sm-6">
+              <img
+                  class="ai-guide-screenshot"
+                  alt="Create Healthchecks.io integration with details"
+                  src="{% static 'img/integrations/setup_pagertree_2.png' %}">
+          </div>
+      </div>
+
+      <div class="row ai-step">
+          <div class="col-sm-6">
+              <span class="step-no">3</span>
+              <p>
+                Copy the <strong>Webhook URL</strong> and paste it below. Save the integration, and you are done!
+              </p>
+          </div>
+          <div class="col-sm-6">
+              <img
+                  class="ai-guide-screenshot"
+                  alt="Copy the Webhook URL"
+                  src="{% static 'img/integrations/setup_pagertree_3.png' %}">
+          </div>
+      </div>
+
       <h2>Integration Settings</h2>
 
       <form method="post" class="form-horizontal" action="{% url 'hc-add-pagertree' %}">