Add description about notification dialog

articles/tools/appsec/getting-started.asciidoc

@@ -121,6 +121,27 @@ The SBOM file, [filename]`bom-npm.json` should be generated in the `/resources`
 AppSec Kit isn't enabled in production mode. Therefore, you'll need to start your application in <</configuration/development-mode#, development mode>> -- which is the mode in which applications start by default. You don't need to enable this, explicitly.
 
 
+=== Notification Dialog
+
+After the application has started, AppSec Kit analyzes the dependencies, collects any vulnerabilities, and displays a notification dialog (see screenshot). There you'll see a link, labeled _Open AppSec Kit_, that you can click on to open the UI in a new tab.
+
+[[getting-started-notification-dialog]]
+.AppSec Kit Notification Dialog
+image::img/notification-dialog.png[]
+
+You can also navigate to the UI using the `vaadin-appsec-kit` route. For example, on your localhost, enter something like this in your browser: link:http://localhost:8080/vaadin-appsec-kit[http://localhost:8080/vaadin-appsec-kit].
+
+You should configure https://vaadin.com/docs/v23/advanced/server-push[server push] for a `UI` so you'll be notified when new vulnerabilities are found. You can do this by adding the `@Push` annotation to a UI class like so:
+
+[source,java]
+----
+@Push
+public class ExampleUI extends UI {
+    // ...
+}
+----
+
+
 == AppSec Kit UI
 
 The AppSec Kit UI has views for seeing vulnerabilities and dependencies of which you should be aware. This section describes those views, which can be found under the two main tabs of the UI.