add admin note block to admin user view

app/views/admin/users/show.html.haml

@@ -141,6 +141,13 @@
             %p This user has an unconfirmed email address#{email}. You may force a confirmation.
             %br
             = link_to 'Confirm user', confirm_admin_user_path(@user), method: :put, class: "btn btn-info", data: { confirm: 'Are you sure?' }
+      - if @user.note.present?
+        - text = "#{@user.note}"
+        .panel.panel-info
+          .panel-heading
+            Admin Note
+          .panel-body
+            %p #{text}
       - if @user.blocked?
         .panel.panel-info
           .panel-heading