title: add two or more email in order confirmation email in magento 2
body: <p>i am working on the order section now i am want to add one or more email to received a order email in magento 2.1.5 version.  i am try to add code on the file .
  vendor/magento/module-quote/Model/ QuoteManagement.php</p>
  
  <p>475 $order->setCustomerEmail($quote->getCustomerEmail());</p>
  
  <pre><code>        $objectManager =   \Magento\Framework\App\ObjectManager::getInstance();
          $connection = $objectManager-&gt;get('Magento\Framework\App\ResourceConnection')-&gt;getConnection('\Magento\Framework\App\ResourceConnection::DEFAULT_CONNECTION');
         $result1 = $connection-&gt;fetchAll(" SELECT *
          FROM  `mg1_customer_entity_varchar` WHERE  `entity_id` = '$suser_id' "); 
  
         $customemail = $result1[0]['value']; 
  
      $order-&gt;setCustomerEmail($customemail ,$quote-&gt;getCustomerEmail());
      $order-&gt;setCustomerFirstname($quote-&gt;getCustomerFirstname());
      $order-&gt;setCustomerMiddlename($quote-&gt;getCustomerMiddlename());
      $order-&gt;setCustomerLastname($quote-&gt;getCustomerLastname());
  </code></pre>
  
  <p>with is code i am getting objectManager |magento\frmework\app\objectManager error .</p>
  
  <p>In addition 
  when i am add emailaddress in  $order->setCustomerEmail("test@gmail.com" ,$quote->getCustomerEmail()); like code then i will send email only first email address it will not pick the second email address parameter can anyone help me to resolved it . Thanks </p>