Add bind9 and Docker files

docker/Dockerfile

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+FROM openjdk:8-jre-slim
+RUN mkdir /gsc
+WORKDIR /gsc
+EXPOSE 19132/udp
+EXPOSE 19133/udp
+CMD ["java", "-Xms1G", "-jar", "GeyserConnect.jar"]

docker/README.md

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+# GeyserConnect using Docker
+This contains the docker image and a basic way of running GeyserConnect
+
+## Setup
+1. Download GeyserConnect to a subfolder called `data`
+2. Build the docker file using `docker build -t geyser-connect .`
+3. Start geyser using this:
+```
+docker run --name "geyser-c" -d --restart always -p 19132:19132/udp -p 19133:19133/udp -v $(pwd)/data:/gsc geyser-connect
+```