Add missing NOMS guidance page

Previously, if we received a 404 when fetching the offences for a PoP
we'd render the generic error page.

As we've identified this scenario to be caused by a missing NOMS number
for the CRN, we want to show guidance to the user in how to correct it.

This commit adds this guidance page which we'll use in an upcoming
commit.

server/views/applications/people/missingNoms.njk

@@ -0,0 +1,30 @@
+{% from "govuk/components/back-link/macro.njk" import govukBackLink %}
+
+{% extends "../../partials/layout.njk" %}
+
+{% set pageTitle = "NOMS number missing from NDelius - " + applicationName %}
+
+{% block beforeContent %}
+
+  {{ govukBackLink({
+    text: "Back",
+    href: paths.applications.start()
+  }) }}
+
+{% endblock%}
+
+{% block content %}
+
+  <div class="govuk-grid-row">
+    <div class="govuk-grid-column-two-thirds">
+      <h1 class="govuk-heading-l">NOMS number missing from NDelius</h1>
+      <p class="govuk-body">The person’s NOMS number is not on NDelius. We are unable to import the person’s index offence or adjudications and ACCT information from NOMIS.</p>
+      <p class="govuk-body">Check the person’s NOMS number on NOMIS and add it to their NDelius record.</p>
+      <p class="govuk-body">Once their NOMS number has been added you will need to start a new referral.</p>
+        <p>
+          <a class="govuk-link" href="{{ paths.applications.index() }}">Return to home page</a>
+        </p>
+    </div>
+  </div>
+
+{% endblock %}