Add a link to Task Queue on dashboard sidebar

app/views/layouts/nav/_dashboard.html.haml

@@ -31,6 +31,12 @@
       %span
         Merge Requests
         %span.count= number_with_delimiter(current_user.assigned_merge_requests.opened.count)
+  = nav_link(path: 'dashboard#tasks') do
+    = link_to dashboard_tasks_path, title: 'Task Queue' do
+      = icon('bell fw')
+      %span
+        Task Queue
+        %span.count= number_with_delimiter(tasks_pending_count)
   = nav_link(controller: :snippets) do
     = link_to dashboard_snippets_path, title: 'Snippets' do
       = icon('clipboard fw')