How to add new entity operations in Drupal 8

entity_operations.php

<?php

/**
 * Implements hook_entity_operation().
 */
function modulename_entity_operation(\Drupal\Core\Entity\EntityInterface $entity) {
  if(in_array($entity->bundle(), ['article'])) {
      $operations = array();
      
      $operations['play'] = array(
      'title' => t('Play'),
      'url' => Url::fromRoute('some.route',["node" => $entity->id()]),
      'weight' => 150,
      );
      
      $operations['another_play'] = array(
      'title' => t('Just an example for multiple'),
      'url' => Url::fromRoute('some.route',["node" => $entity->id()]),
      'weight' => 151,
      );
      return $operations;
  }
}