docs: add link to github dicussion on readme

Author: mdeandrea-mrmilu

README.md

@@ -342,7 +342,7 @@ You have some ways to contribute to this packages
 
 ### Questions and answers
 
-You can search answers on Github discussion or on [StackOverflow](https://stackoverflow.com/questions/tagged/flutter-form-builder)
+You can question or search answers on [Github discussion](https://github.com/flutter-form-builder-ecosystem/phone_number/discussions) or on [StackOverflow](https://stackoverflow.com/questions/tagged/flutter-form-builder)
 
 ### Donations