Create Woocommerce custom email notification

functions.php

<?php

$mailer = WC()->mailer();

$template = '/emails/customer-admin-order-status.php';

//format the email
$subject = 'Order Status Update';
$content = wc_get_template_html( $template, array(
  'order'         => $order,
  'email_heading' => $subject,
  'sent_to_admin' => false,
  'plain_text'    => false,
  'email'         => $mailer
) );
$headers = "Content-Type: text/html\r\n";

//send the email through wordpress
$mailer->send( $recipient, $subject, $content, $headers );