Add README.md

README.md

+#Thymio Game
+
+A competitive game in groups with Thymio.
+
+##Running the game
+
+The game needs at least Python 3.6.
+
+```bash
+git clone https://gitlab.laas.fr/tpillot/thymio-game.git
+cd thymio-game
+python -m venv
+. venv/bin/activate
+pip install -r requirements.txt
+python main.py
+```
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