UI improvement - Countdown Timer

[JPTomorrow]

UI improvements as per issue #2.

I have added a countdown after the user selects their input. It displays "ROCK", followed by "PAPER", followed by "SCISSORS", followed by "SHOOT!" in 500 millisecond interval before showing the result.

This mimics the real life tradition in RPS of shouting out "ROCK, PAPER, SCISSORS, SHOOT!" before both players throw out their hand with the selection they have made. It adds a small feeling of suspense and engagement before the result that I feel is missing.

I have also taken the opportunity to assign a fixed width to the result text so that surrounding elements do not reposition themselves as the result text changes.

Added vscode ignores to ,gitignore as well.

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[zetabug]

@JPTomorrow Great work.
Though I have already merged a PR that added shake animation to the project, so the countdown has already been added, but it doesn't display ROCK, PAPER, SCISSORS before countdown. It would look cool if it displays the words before countdown.

I want you to submit a new PR working your way around the latest features added.