add seed laravel code example

Example 1: laravel run seed

#All of them
php artisan db:seed
#One class
php artisan db:seed --class=UserSeeder

Example 2: create migration model and seeder laravel at once

php artisan make:model MODEL_PATH\MODEL_NAME -ms
  
-m, --migration Create a new migration file for the model.
-s, --seeder Create a new seeder file for the model.