<!-- BEGIN COPY / PASTE -->
    // Register Custom Post Type
    function create_custom_post_type() {
      $args = array(
        'label'               => __( 'Books', 'text_domain' ),
        'public'              => true,
        'has_archive'         => true,
        'supports'            => array( 'title', 'editor', 'thumbnail' ),
        'rewrite'             => array( 'slug' => 'books' ),
      );
      register_post_type( 'book', $args );
    }
    add_action( 'init', 'create_custom_post_type', 0 );

    // Template Hierarchy
    // Create single-book.php and archive-book.php in your theme for custom templates.
    <!-- END COPY / PASTE -->