Add Docker support

Dockerfile

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+FROM nginx:alpine
+COPY index.html /usr/share/nginx/html/index.html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

docker-compose.yml

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+version: '3.8'
+services:
+  turtle-game:
+    build: .
+    ports:
+      - "8080:80"
+    restart: unless-stopped