adds managers section to admin

app/views/admin/managers/_manager.html.erb

@@ -0,0 +1,13 @@
+<span><%= manager.name %></span>
+<span class="bullet">&nbsp;&bull;&nbsp;</span>
+<span><%= manager.email %></span>
+<% if manager.persisted? %>
+  <%= link_to t('admin.managers.manager.delete'),
+    admin_manager_path(manager),
+    method: :delete,
+    class: "button small alert float-right"
+  %>
+<% else %>
+  <%= link_to t('admin.managers.manager.add'),{ controller: "admin/managers", action: :create, user_id: manager.user_id },
+    method: :post, class: "button small success float-right" %>
+<% end %>