Add README

Author: somacdivad

asterioids-pygame-project/README.md

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+# Build an Asteroids Game With Python and Pygame
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+The code in this folder supplements the tutorial [Build an Asteroids Game With Python and Pygame](https://realpython.com/asteroids-game-python/).
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+There are eleven subfolders: one for each of the ten steps in the project and one with the final source code of the full game.