Title: Add Email and Phone Columns to the PrestaShop Order List

My store is running PrestaShop 1.6.1.6 and I need a small yet precise back-office tweak. In the Orders list I want two extra columns—customer email and customer account phone number—shown right beside the existing Order ID, customer name, total, etc... (Budget: $10 - $30 USD, Jobs: API Integration, CSS, Database Management, HTML, JavaScript, MySQL, PHP, Prestashop, Software Development, Web Development)