add info/faq  about testing issues

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-payu-latam-gateway/trunk@853346 b8457f37-d9ea-0310-8a92-e5e31aec5664
add info/faq  about testing issues

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-payu-latam-gateway/trunk@853351 b8457f37-d9ea-0310-8a92-e5e31aec5664