Link to downloadable report for org usage

Link is sticky so that it is easy to spot even when
an org has many services.

app/main/views/organisations.py

@@ -156,10 +156,20 @@ def organisation_dashboard(org_id):
         **{
             f'total_{key}': sum(service[key] for service in services)
             for key in ('emails_sent', 'sms_cost', 'letter_cost')
-        }
+        },
+        download_link=url_for(
+            '.download_services_report_for_org',
+            org_id=org_id,
+        )
     )
 
 
+@main.route("/organisations/<uuid:org_id>", methods=['GET'])
+@user_has_permissions()
+def download_services_report_for_org(org_id):
+    pass
+
+
 @main.route("/organisations/<uuid:org_id>/trial-services", methods=['GET'])
 @user_is_platform_admin
 def organisation_trial_mode_services(org_id):

app/templates/views/organisations/organisation/index.html

@@ -112,4 +112,10 @@
     <div class="keyline-block govuk-!-margin-top-2"></div>
   {% endif %}
 
+  <div class="js-stick-at-bottom-when-scrolling">
+    <p class="bottom-gutter">
+      <a href="{{ download_link }}" download="download" class="govuk-link govuk-link--no-visited-state govuk-!-font-weight-bold">Download this report</a>
+    </p>
+  </div>
+
 {% endblock %}