add_action( 'woocommerce_before_cart_table', 'woo_add_continue_shopping_button_to_cart' );
function woo_add_continue_shopping_button_to_cart() {
$shop_page_url = get_permalink( woocommerce_get_page_id( 'shop' ) );
echo '<div class="woocommerce-message">';
echo ' <a href="'.$shop_page_url.'" class="button">Continue Shopping →</a> Would you like some more goods?';
echo '</div>';
}