Add Docker example

Dockerfile

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+FROM openjdk:slim
+COPY --from=python:3 / /
+
+WORKDIR /usr/src/app
+
+# Prepare Minecraft - Matrix bridge
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Prepare MC server
+COPY server.jar ./
+RUN java -jar server.jar --nogui
+
+COPY . .
+
+# Buffer Python's stdout for debugging during runtime
+ENV PYTHONUNBUFFERED=1
+
+CMD ["python", "main.py", "java", "-Xmx1024M", "-Xms1024M", "-jar", "server.jar", "nogui"]

start.sh

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+sudo docker run \
+-p 25565:25565 \
+-v "<folder in which your store your Minecraft world>":/usr/src/app/world \
+-e EULA=true \
+-e WHITELIST=false \
+-e VERIFY_ACCOUNTS=true \
+-e MATRIX_HOMESERVER='<your matrix homeserver>' \
+-e MATRIX_USERNAME='<matrix bridge client username>' \
+-e MATRIX_PASSWORD='<matrix bridge client password>' \
+-e MC_CHANNEL='<channel in which you communicate>' \
+-e SERVER_ADDRESS='<ip address where players can connect to the server>' \
+mc-bridge