Added relevant dockerfile

Dockerfile

@@ -0,0 +1,29 @@
+FROM maven:3.6.3-jdk-8 as build
+
+RUN apt-get install -y wget
+
+WORKDIR /graphhopper
+
+COPY . .
+
+RUN ./graphhopper.sh build
+
+FROM openjdk:11.0-jre
+
+ENV JAVA_OPTS "-Xmx1g -Xms1g -Ddw.server.application_connectors[0].bind_host=0.0.0.0 -Ddw.server.application_connectors[0].port=8989"
+
+RUN mkdir -p /data
+
+WORKDIR /graphhopper
+
+COPY --from=build /graphhopper/web/target/*.jar ./web/target/
+# pom.xml is used to get the jar file version. see https://github.com/graphhopper/graphhopper/pull/1990#discussion_r409438806
+COPY ./graphhopper.sh ./pom.xml ./config-example.yml ./
+
+VOLUME [ "/data" ]
+
+EXPOSE 8989
+
+ENTRYPOINT [ "./graphhopper.sh", "web" ]
+
+CMD [ "/data/europe_germany_berlin.pbf" ]