added sample data command to readme

README.md

@@ -35,6 +35,11 @@ Akaunting uses [Laravel](http://laravel.com), the best existing PHP framework, a
 ```bash
 php artisan install --db-name="akaunting" --db-username="root" --db-password="pass" --admin-email="admin@company.com" --admin-password="123456"
 ```
+* Create sample data (optional):
+
+```bash
+php artisan sample-data:seed
+```
 
 ## Contributing