A WordPress plugin template that has an admin menu. Visit https://www.davidangulo.xyz/ for more information.

admin.php

<?php
/*
Plugin Name: My WordPress Plugin
Plugin URI: https://wordpress.org/plugins/
Description: Just another WordPress plugin.
Version: 1.0.0
Author: David Angulo
Author URI: https://www.davidangulo.xyz/
*/

add_action('admin_menu','addAdminPageContent');

function addAdminPageContent() {
	add_menu_page('My Plugin','My Plugin','manage_options',__FILE__,'adminPageContent','dashicons-wordpress');
}

function adminPageContent() {
	echo "<h2>My WordPress Plugin</h2>Hello world!";
}

//Visit the tutorial for more information
//https://www.davidangulo.xyz/website-development/how-to-create-an-admin-page-for-your-wordpress-plugin/