add faq to readme

git-svn-id: https://plugins.svn.wordpress.org/custom-taxonomy-order-ne/trunk@1003901 b8457f37-d9ea-0310-8a92-e5e31aec5664
add faq to readme

git-svn-id: https://plugins.svn.wordpress.org/custom-taxonomy-order-ne/trunk@1003907 b8457f37-d9ea-0310-8a92-e5e31aec5664