Empty plugin with a search field for WP REST API tut

empty_plugin_with_a_search_field.php

<?php
/**
 * Plugin Name: SZ WP REST API Tutorial
 * Description: It's an example of WP REST API usage for search with autocomplete with vanilla JS
 * Plugin URI:  
 * Author:      Sabrina Zeidan
 * Author URI:  https://sabrinazeidan.com
 * License:     GNU General Public License v2 or later
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 *
 */

defined( 'ABSPATH' ) or die();

class SZ_WP_REST_API_Tut { 
    function __construct() {		
        add_action( 'admin_menu', array( $this, 'admin_menu' ) ); //Add an item to the Tools menu		
		add_filter('plugin_action_links_' . plugin_basename(__FILE__), array( $this, 'plugin_actions_links' ) ); //Add a link on Plugins page
    } 
 
    public function admin_menu() {
           $hook = add_management_page( 'SZ WP REST API', 'SZ WP REST API', 'manage_options', 'sz-search', array( $this, 'admin_page_content' ), '' ); //Add a page to the Tools menu
           add_action( "load-$hook", array( $this, 'admin_page_load' ) );//hook to load stuff on that page
    }
 	function plugin_actions_links( array $actions ) {
			return array_merge( array(
			'sz-search'    => sprintf('<a href="%s">%s</a>', esc_url( admin_url( 'tools.php?page=sz-search' ) ),esc_html__( 'See it', '' ))), $actions );
	}
    function admin_page_load() {
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ) ); // Load needed JavaScript and CSS		
    }
	
	function enqueue_scripts() {
		
	}
	
    function admin_page_content() {
		echo '<div class="wrap">';
		echo '<h1>' . esc_html_x( 'SZ WP REST API Search with autocomplete with Vanilla JavaScript', 'admin page title', 'sz-wp-rest-api-search' ) . '</h1>';		
		echo '<p>This is a search field intended to demostrate a result of WP REST API. Does it work? :)</br>';
		echo '<p><input type="text" size="80" id="sz-search-field" name="sz-search-field" value="" placeholder="Start typing the title of the post...">';//Our search field
		echo '<br><input type="hidden" size="80" id="sz_result_id" name="sz_result_id" value="">';//Hidden field to pass post ID
		echo '<br><input type="hidden" size="80" id="sz_result_permalink" name="sz_result_permalink" value="">';//Hidden field to pass post permalink
		echo '</div>';
    }
}
new SZ_WP_REST_API_Tut(); //Let's do it!