simple_notification.kt

           //Create a simple notification, first - > Channel ID
            val simpleNotification = NotificationCompat.Builder(this, "first")
                .setSmallIcon(R.drawable.ic_launcher_foreground)
                .setContentTitle("Hello There")
                .setContentText("General Master!")
                .setPriority(NotificationCompat.PRIORITY_DEFAULT).build()

            //Show the notification, nm is the NotificationManager object
            nm.notify(id, simpleNotification)