i need to call top menu or header out ide the magento project in that case how to call it in magento2
in magento1.x we use
<?php
require_once(dirname(__FILE__).'/store/app/Mage.php');
$app = Mage::app();
$session = Mage::getSingleton('core/session', array('name'=>'frontend'));
$block = $app
->getLayout()
->getBlockSingleton('checkout/cart_sidebar')
->setTemplate('checkout/cart/sidebar.phtml');
echo $block->toHtml();
in magento2.0 how to do it?