Custom Post Type with Default Category and Tags

// Hook into the init action and call create_post_type when it fires
   add_action( 'init', 'create_post_type' );

   function create_post_type() {
    $labels = array( // define the name of the custom post type
    'name'  => _x('Articles','custom post type general name'),
    'singular_name' => _x('Article','custom post type singular name' ),
    'add_new'   => _x('Add New','article'),
    'add_new_item'  => __('Add New Article'),
    'edit_item' => __('Edit Article'),
    'new_item'  => __('New Article'),
    'all_items' => __('All Articles'),
    'view_item' => __('View Article'),
    'search_items'  => __('Search Articles'),
    'not_found' => __('No articles found'),
    'not_found_in_trash'    => __('No articles found in Trash'),
    'parent_item_colon' => '',
    'menu_name' => 'Articles'
    );

    $args = array(
    'labels'    => $labels,
    'public'    => true,  // true=show the post type in the admin section
    'publicly_queryable'    => true,
    'show_ui'   => true,  // generate a default admin user interface
    'show_in_menu'  => true,  // display as a top-level menu item
    'query_var' => true,
    'rewrite'   => array('slug' => 'articles'),  // rewrite the url to make it pretty
    'menu_position' => 5,     // show below Posts but above Media
    'supports'  => array( 'title', 'editor', 'comments', 'revisions', 'author', 'excerpt', 'custom-fields', 'thumbnail' ),
    'has_archive'   => true,
    'taxonomies'    => array('category', 'post_tag'),  // just use default categories and tags
    'show_in_nav_menus' => true // makes this post type available for selection in navigation menus
    );


    register_post_type('tnt_articles', $args);

  }