Basic Custom Post Type with extended-cpts

Basic_CPT_with_extended-cpts.php

<?php

/**
* Custom Post Type with extended-cpts
* http://johnbillion.com/extended-cpts/
* https://github.com/johnbillion/extended-cpts
*/
add_action('init', function () {
    register_extended_post_type('project', [
        'has_archive' => false,
        'admin_cols' => [
            'project_featured_image' => [
                'title'          => 'Thumbnail',
                'featured_image' => 'thumbnail',
                'width'          => 80,
                'height'         => 80,
            ],
            'title' => [
                'title' => 'Title',
            ],
            'project_description' => [
                'title'    => 'Description',
                'meta_key' => 'project_description',
            ],
        ],
    ], [
        'singular' => 'Project',
        'plural'   => 'Projects',
        'slug'     => 'project',
    ]);
});