Added leaderboard #18
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I've added a leaderboard page.
The high scores are saved in the browser's local storage. I chose local storage because it doesn't get deleted and it has more storage.
I've created a leaderboard object that has an array of the high scores so all the changes to the high scores is made to the array and only then applied to the local storage.
When the game is loaded it checks if there are already high scores and then loads them. it loads the high scores only once and if there's a new high score.