add reverb container, unread attribute in notification pivot table and private channel and event for new register

app/Models/User.php

@@ -61,7 +61,9 @@ class User extends Authenticatable
             Notification::class,
             'notification_user',
             'user_id',
-            'notification_id'
-        )->withTimestamps();
+            'notification_id',
+        )
+            ->withPivot('unread')
+            ->withTimestamps();
     }
 }