Readme, screenshot

Author: ivanperez-keera

examples/FlappyBird/README.md

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+A simple implementation of Flappy Bird in 120 locs*.
+
+It uses an experimental extension to Yampa, with Signals/Sources/Sinks,
+to structure the backends.
+
+The code should be trivial to understand. If it isn't, we're doing
+something wrong. Please, open a bug report if that's the case.
+
+![Screencast](https://github.com/keera-studios/haskell-game-programming/raw/master/examples/FlappyBird/screenshot.gif)
+
+(* without comments, empty lines or imports.)