Build a Flashcard Quiz App

In this lab, you will create an app that displays and stores flashcard data that can be retrieved later. **Objective:** Fulfill the user stories below and get all the tests to pass to complete the lab. **User Stories:** 1) You should have an HTML element with an id of `flashcard`. 2) You should have an interface called `FlashCard`. 3) The `FlashCard` interface should contain the following properties `questionText` and `questionAnswer` both of type `string`. 4) You should have a collection of `FlashCard` elements called `currentCards`. 5) When the `#flashcard` element is clicked, the card should have the `flipped` class. 6) You should have an element with an id of `delete-btn`. 7) When the `#delete-btn` element is clicked, it should remove current card and display the previous card data. 8) You should create an entry form with an id of `entry-form` to be able to add more flashcards to the `currentCards` collection on submit. 9) The two elements inside of the form should have an id of `front-text` and `back-text` respectively. 10) You should create and call an `InvalidUserInputError` when either the question text or question answer is empty in the entry form.