Update README.md

Author: heloufir

README.md

@@ -29,13 +29,16 @@ By executing the commands:
 `php artisan db:seed`
 
 > Here the database configuration is done, you got the database structure and the minimal data inserted by the seeder to make the application work, if you want demo data to be inserted, you need to run the following commands:
+> Before you execute demo data seeder, you need to run queue listener: `php artisan queue:work`, because there is some data that will be inserted via jobs
 >    - `php artisan db:seed --class=ContentSeeder`
 >    - `php artisan db:seed --class=NotificationSeeder`
 
 ### Automatically
 
 By executing the command: `composer run app-install`
 
+> Before you execute the composer command, you need to run queue listener: `php artisan queue:work`, because there is some data that will be inserted via jobs
+
 > Please note that this command will insert also demo data into your database (if you don't need demo data, please use the manual configuration above)
 
 ## Serve the application