Add support for error,success,warning states on the textField
https://www.sketch.com/s/58343494-5cb5-4325-9899-16e5f4657ad0/a/9Plg43n#Activity
The textField should have error,warning,success states with icons and erorr messages:
As part of this issue we should work out how we want screenreaders to announce errors/warnings (possibly using rule="alert"