php artisan looking in in Database\Seeders not Database\Seeds code example
Example 1: how to make db seeder in laravel
php artisan make:seeder UsersTableSeeder
Example 2: alias seeddb='php artisan db:seed'
alias dbseed='php artisan db:seed'
php artisan make:seeder UsersTableSeeder
alias dbseed='php artisan db:seed'