add Dockerfile, docker-compose, dependencies, and documentation

Dockerfile

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+# extract mcrcon
+FROM debian:bookworm-slim AS builder
+
+ADD https://github.com/Tiiffi/mcrcon/releases/download/v0.7.2/mcrcon-0.7.2-linux-x86-64-static.zip /usr/bin/mcrcon.zip
+RUN apt-get update && apt-get install -y unzip 
+
+RUN unzip -j /usr/bin/mcrcon.zip -d /usr/bin/mc-rcon && chmod a+x /usr/bin/mc-rcon/mcrcon
+
+
+# actual image
+FROM eclipse-temurin:21
+
+COPY --from=builder /usr/bin/mc-rcon /usr/bin/mc-rcon
+COPY start-server.sh /usr/bin/start-server.sh
+RUN chmod a+x /usr/bin/start-server.sh
+COPY mcrcon /usr/bin/mcrcon
+RUN chmod a+x /usr/bin/mcrcon
+COPY template/ /defaults/
+
+WORKDIR /minecraft_data
+ENTRYPOINT ["/usr/bin/start-server.sh"]
+