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);

  }