How to add jquery plugin in Drupal 8?

@mallory_cormier 

To add a jQuery plugin to your Drupal 8 site, you will need to follow these steps:

1. Download the plugin and place it in your module's folder (usually /modules/custom/your_module_name/js).
2. Include the plugin in your module by using hook_library_info(). This function should be placed in your module's .module file, and should return an array of libraries that your module uses. For example:

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function your_module_name_library_info() {
  $libraries['your_jquery_plugin'] = [
    'title' => 'Your jQuery Plugin',
    'version' => '1.0',
    'js' => [
      'js/your_jquery_plugin.js' => [],
    ],
  ];
  return $libraries;
}

1. Attach the library to a render array using #attached:

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$build['#attached']['library'][] = 'your_module_name/your_jquery_plugin';

1. Flush the cache so that Drupal can detect the new library.
2. Test the plugin to ensure that it is working as expected.