Leaderboard: Hit the API

[BenjaminSemah]

Leaderboard - Hit the API

In this branch, I have done the following;

• Create a new game following guidelines from the Leaderboard API documentation,
• Implemented the "Refresh" button (to receive data from the API and parse the JSON),
• Implemented the form "Submit" button (to send user scores data to the API),
• Used async and await JavaScript features to consume the API.

[BenjaminSemah]

All Required Changes has been Implemented.

I have implemented the following changes pointed out by first Code Reviewer;

• Changed functions to ES6 using arrow function syntax.
• Added validation to ensure user score input is a number.