Update README.md

Called attention to the validation/acceptance + added mention of open dialog wrt FB/IOS joy

README.md

@@ -9,5 +9,10 @@ See https://publicsuffix.org/ and the [Wiki](https://github.com/publicsuffix/lis
 
 [![Build Status](https://travis-ci.org/publicsuffix/list.svg?branch=master)](https://travis-ci.org/publicsuffix/list)
 
+**Are you here to add or update something?**
+
+All submissions must conform to the [validation and acceptance factors](https://github.com/publicsuffix/list/wiki/Guidelines#validation-and-non-acceptance-factors) and provide sufficient rationale or basically be as complete as possible.
+The list is maintained by people volunteering their time.  Iteration back and forth will delay PR review or inclusion.
+
 Important Notice:
-2021-04-23 : Did guidance related to an issue with Facebook or Apple bring you here?  [Read this before submitting requests](https://github.com/publicsuffix/list/issues/1245)
+2021-04-23 : Did guidance related to an issue with Facebook or Apple bring you here?  [Read this before submitting requests](https://github.com/publicsuffix/list/issues/1245)  We are not approving workaround requests per the validation and acceptance standards, but do have open discussion with Facebook on the matter.