Top Level Plugin

<?php
/**
 * Plugin Name: Home Page CPT
 **/

add_action( 'admin_menu', 'my_admin_menu' ); 
 function my_admin_menu() {
        add_menu_page( 'My Top Level Menu Example', 'Top Level Menu', 'manage_options', 'example.php', 'myplguin_admin_page', 'dashicons-tickets', 6  );
    }

    function myplguin_admin_page(){

        echo 'HOW DO I A CUSTOM FIELDS / META BOXES HERE?';
    
    }

Cool