Plugin Reusable Code - Maintenance Page

gistfile1.txt

// Header
// Codex - https://developer.wordpress.org/plugins/plugin-basics/header-requirements/ 

/**
 * Plugin Name
 *
 * @package           PluginPackage
 * @author            David Jenner
 * @copyright         David Jenner
 * @license           GPL-2.0-or-later
 *
 * @wordpress-plugin
 * Plugin Name:       Maintenance or Coming Soon Page
 * Plugin URI:        https://example.com/plugin-name
 * Description:       A maintenance plugin
 * Version:           1.0.0
 * Requires at least: 5.2
 * Requires PHP:      7.2
 * Author:            David Jenner
 * Author URI:        https://example.com
 * Text Domain:       maintenance-page
 * License:           GPL v2 or later
 * License URI:       http://www.gnu.org/licenses/gpl-2.0.txt
 * Update URI:        https://example.com/my-plugin/
 */


// Adding the Styling
// links to maintenence-page-styles

// Enqueue styles for the frontend
function enqueue_maintenance_page_styles() {
    wp_enqueue_style('admin-plugin-styles', plugin_dir_url(__FILE__) . 'admin-plugin-styles.css', array(), '1.0.0', 'all');
    wp_enqueue_style('maintenance-page-styles', plugin_dir_url(__FILE__) . 'maintenance-page.css', array(), '1.0.0', 'all');
}
add_action('wp_enqueue_scripts', 'enqueue_maintenance_page_styles');


// Add a settings page to the admin menu
function add_maintenance_settings_page() {
    add_menu_page(
        'Maintenance Page Settings',
        'Maintenance Page',
        'manage_options',
        'maintenance-settings',
        'maintenance_settings_page',
        'dashicons-admin-generic',
        20
    );
}
add_action('admin_menu', 'add_maintenance_settings_page');


// Display the settings page
function maintenance_settings_page()
    // code



// Hook to display maintenance page
function display_maintenance_page()
    // code