add-custom-field-on-product-page.php

<?php
add_action( 'woocommerce_before_add_to_cart_button', 'add_fields_before_add_to_cart' );

function add_fields_before_add_to_cart( ) {
	?>
	<table>
		<tr>
			<td>
				<?php _e( "Name:", "aoim"); ?>
			</td>
			<td>
				<input type = "text" name = "customer_name" id = "customer_name" placeholder = "Name on Gift Card">
			</td>
		</tr>
		<tr>
			<td>
				<?php _e( "Message:", "aoim"); ?>
			</td>
			<td>
				<input type = "text" name = "customer_message" id = "customer_message" placeholder = "Your Message on Gift Card">
			</td>
		</tr>
	</table>
	<?php
}