Validate Country

Uses a Google Sheet to validate country input in response to a question. Country list acquired from here: https://www.dfa.ie/travel/travel-advice/a-z-list-of-countries/ Google Sheet example here: https://docs.google.com/spreadsheets/d/1Cu_1EezYv1XuK-4PkclyuUKcQ2qT95JQH5omPpi3XC8/edit?usp=sharing