Create custom "restaurant" post type

restaurants.php

<?php
/**

Assuming you create this file in your "lib" directory, add this file into your functions.php like this:
require_once get_template_directory() . '/lib/restaurants.php';

**/

if (!class_exists('theme_restaurants')) {

    class theme_restaurants
    {

        public function __construct()
        {
            add_action('init', array($this, 'restaurants'), 0);
        }

        public static function restaurants()
        {

            $labels = array(
                'name' => _x('Restaurants', 'Post Type General Name', 'text_domain'),
                'singular_name' => _x('Restaurant', 'Post Type Singular Name', 'text_domain'),
                'menu_name' => __('Restaurants', 'text_domain'),
                'name_admin_bar' => __('Restaurants', 'text_domain'),
                'archives' => __('Restaurants', 'text_domain'),
                'parent_item_colon' => __('Parent Restaurant:', 'text_domain'),
                'all_items' => __('All Restaurants', 'text_domain'),
                'add_new_item' => __('Add New Restaurant', 'text_domain'),
                'add_new' => __('Add New', 'text_domain'),
                'new_item' => __('New Restaurant', 'text_domain'),
                'edit_item' => __('Edit Restaurant', 'text_domain'),
                'update_item' => __('Update Restaurant', 'text_domain'),
                'view_item' => __('View Restaurant', 'text_domain'),
                'search_items' => __('Search Restaurant', 'text_domain'),
                'not_found' => __('Not found', 'text_domain'),
                'not_found_in_trash' => __('Not found in Trash', 'text_domain'),
                'featured_image' => __('Featured Image', 'text_domain'),
                'set_featured_image' => __('Set featured image', 'text_domain'),
                'remove_featured_image' => __('Remove featured image', 'text_domain'),
                'use_featured_image' => __('Use as featured image', 'text_domain'),
                'insert_into_item' => __('Insert into Restaurant', 'text_domain'),
                'uploaded_to_this_item' => __('Uploaded to this Restaurant', 'text_domain'),
                'items_list' => __('Restaurants list', 'text_domain'),
                'items_list_navigation' => __('Restaurants list navigation', 'text_domain'),
                'filter_items_list' => __('Filter products list', 'text_domain')
            );
            $args = array(
                'label' => __('Restaurant', 'text_domain'),
                'description' => __('Restaurants completed', 'text_domain'),
                'labels' => $labels,
                'supports' => array('title', 'editor', 'thumbnail', 'excerpt'),
                'taxonomies' => array(),
                'hierarchical' => false,
                'public' => true,
                'show_ui' => true,
                'show_in_menu' => true,
                'menu_position' => 25,
                'menu_icon' => 'dashicons-food',
                'show_in_admin_bar' => true,
                'show_in_nav_menus' => true,
                'can_export' => true,
                'has_archive' => false,
                'exclude_from_search' => false,
                'publicly_queryable' => true,
                'capability_type' => 'post',
                'show_in_rest' => true,
            );
            register_post_type('restaurants', $args);
        }
    }

    new theme_restaurants();
}