Add taxonomies to worpress media attachments

media-taxonomies.php

/**
 *  add categories for attachments 
 */
function add_categories_for_attachments() {
    register_taxonomy_for_object_type('category', 'attachment');
}

add_action('init', 'add_categories_for_attachments');

/**
 * add tags for attachments 
 */
function add_tags_for_attachments() {
    register_taxonomy_for_object_type('post_tag', 'attachment');
}

add_action('init', 'add_tags_for_attachments');