Add a support index page

Our support process is about to get more fully fledged so we’ll need
an index page to route people properly.

We reckon that users will also want to know what the support process is,
so let’s explain it on this page.

app/templates/views/support/feedback.html

@@ -0,0 +1,34 @@
+{% extends "withoutnav_template.html" %}
+{% from "components/textbox.html" import textbox %}
+{% from "components/page-footer.html" import page_footer %}
+
+{% block page_title %}
+  Feedback – GOV.UK Notify
+{% endblock %}
+
+{% block maincolumn_content %}
+
+    <h1 class="heading-large">
+      Support and feedback
+    </h1>
+    <div class="grid-row">
+      <div class="column-two-thirds">
+        <div class="panel panel-border-wide">
+          <p>
+            Check our <a href="https://status.notifications.service.gov.uk">system status</a> 
+            page to see if there are any known issues with GOV.UK Notify.
+          </p>
+        </div>
+        <p>What went wrong, if anything? What went well? How could we improve this service?</p>
+        <form method="post">
+            {{ textbox(form.feedback, width='1-1', hint='', rows=10) }}
+            <h3 class="heading-medium">Do you want a reply?</h3>
+            <p>Leave your details below if you'd like a response.</p>
+            {{ textbox(form.name, width='1-1') }}
+            {{ textbox(form.email_address, width='1-1') }}
+            {{ page_footer('Send') }}  
+        </form>
+      </div>
+    </div>
+
+{% endblock %}