Add diligent academy frontend challenge

diligent-academy-assessments/backend/coding-challenge/.gitignore

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+node_modules
+take-home-assessment-prototype.iml
+.idea/

diligent-academy-assessments/backend/coding-challenge/README.md

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+# Coding challenge
+
+## How to use
+
+- Use `npm test` to check your work. This command runs the tests in watch mode, so you do  not need to rerun it when you change your code.
+
+## Principles and rules
+
+- You can change code in the `src/implementations` folder.
+- **Do not modify anything in the `src/sealed` and `test` folders.**
+
+## Tasks
+
+Implement the methods in the `user.js` file.
+
+The `User` class has the following methods:
+
+- `borrow(book, library)` - This method should add the book to the user's borrowed books list, and
+  remove the book from the library's available books list.
+
+
+- `hasBook(book)` - This method should return a boolean if the user has the book borrowed.
+
+
+- `return(book, library)` - This method should remove the book from the user's borrowed books list,
+  and
+  add the book to the library's available books list. It should return true if the book was successfully returned, and false if the user does not have the book borrowed.
+
+
+- `getBookNames()` - This method should return the list of names of the books the user has borrowed.

diligent-academy-assessments/backend/coding-challenge/babel.config.js

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+module.exports = { presets: ["@babel/preset-env"] };

diligent-academy-assessments/backend/coding-challenge/jest.config.js

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+module.exports = {
+    transform: {
+        "^.+\\.(js|jsx)$": "babel-jest",
+    },
+};