Easy PHP/AJAX Assignment

You have the following schema: https://imgur.com/a/fdWEW

You have to do the following:

Design an HTML form to enter a language (Arabic, English, and Spanish etc.) in a text field. Then, when the user clicks a search button, the php code

Lists all the countries whose official language is identical to the entered one.

[Note: when user enters a part of the language word, the system suggests a list of languages for the user to help him/her type the language correctly]