Added readme

Author: szymmirr

README.md

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+# Retro Quickscope Simulator
+**Retro Quickscope Simulator** aka **MLG Quickscoper** is an HTML5 game made with [Construct 2](https://www.construct.net/en) in 2014.
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+You can test the game by uploading [exported files](https://github.com/szymmirr/retro-quickscope-simulator/releases) on a server or by running it on localhost, eg. with [XAMPP](https://www.apachefriends.org/pl/index.html).
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+![Retro Quickscope Simulator](https://user-images.githubusercontent.com/12998256/87182312-32de8f80-c2e4-11ea-8411-054b4ca6201e.gif)
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+No idea why the game over screen is visible all time, I tested it with 2014 version of Firefox and nothing changed.