Adding a menu page

menu.php

<?php
function myplugin_options_page()
{
    // add top level menu page
    add_menu_page(
        'Options Page',
        'Options Page Title',
        'manage_options',
        'myplugin-options',
        'myplugin_render_options_page'
    );
}
add_action('admin_menu', 'myplugin_options_page');

function myplugin_render_options_page() { 
   if (!current_user_can('manage_options')) {
        return;
   } ?>
   <div class="wrap">
        <h1><?= esc_html(get_admin_page_title()); ?></h1>
        <p>Page content goes here</p>
    </div>
    <?php
}