add links to plugin description

plugin_description_links.php

<?php
add_filter( 'plugin_action_links_' . plugin_basename(__FILE__), 'prefix_add_action_links' );
function prefix_add_action_links ( $links ) {
    $mylinks = array(
        '<a href="admin.php?page=example_page">Settings</a>',
    );
    return array_merge( $links, $mylinks );
}