Add example how to hide notifications again (#419)

Related to: openhab/openhab-addons#17978.

Signed-off-by: lsiepel <[email protected]>

Author: lsiepel

README.md

@@ -855,6 +855,13 @@ actions.notificationBuilder('Hello World!').logOnly().send();
 // Sends a simple log notification with icon and tag
 actions.notificationBuilder('Hello World!').logOnly()
   .withIcon('f7:bell_fill').withTag('important').send();
+
+// Sends a notification about a temperature change ...
+actions.notificationBuilder('new temperature: xyz').withIcon('oh:temperature').withTag('Temperature change').withReferenceId('livingRoom').send();
+// ... and hides it again after 10 minutes
+setTimeout(() => {
+  actions.notificationBuilder().hide().withReferenceId('livingRoom').send();
+}, 10 * 60 * 1000);
 ```
 
 See [openhab-js : actions.NotificationBuilder](https://openhab.github.io/openhab-js/actions.html#.notificationBuilder) for complete documentation.