Added README

README.md

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+# Tetris
+
+Simple tetris game built with [Bevy](https://bevy.org/)
+
+## Running with cargo
+
+```shell
+cargo run
+```
+
+## Building
+
+```shell
+cargo build
+```
+
+## Controls
+
+**Left / Right arrow:** move piece
+
+**Up arrow:** rotate piece clockwise
+
+**Left Shift:** rotate piece counter-clockwise
+
+**Down arrow:** soft drop
+
+**Space bar:** hard drop