Adds Dockerfile for CLI.

cli/Dockerfile

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+FROM openjdk:8 AS build
+
+ARG CLI_VERSION="0.3.0"
+
+RUN curl -s https://codeload.github.com/apiman/apiman-cli/zip/v${CLI_VERSION} -o /tmp/apiman-cli-${CLI_VERSION}.zip && \
+	unzip /tmp/apiman-cli-${CLI_VERSION}.zip -d /tmp && \
+	mv /tmp/apiman-cli-${CLI_VERSION} /tmp/apiman-cli && \
+	chmod +x /tmp/apiman-cli/gradlew
+
+WORKDIR /tmp/apiman-cli
+RUN ./gradlew shadowJar
+
+FROM openjdk:8-jre-alpine
+
+RUN mkdir -p /opt/apiman-cli/lib
+COPY --from=build /tmp/apiman-cli/build/libs/* /opt/apiman-cli/lib/
+
+ENTRYPOINT [ "java", "-jar", "/opt/apiman-cli/lib/apiman-cli.jar" ]

cli/README.md

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+apiman cli
+==========
+
+## Usage
+
+To use apiman CLI
+
+    docker run -it apiman/cli [args]
+
+For valid arguments, please see the documentation for [apiman CLI](https://github.com/apiman/apiman-cli)
+
+## Building the image
+
+    docker build -t="apiman/cli" --rm .
+
+## Image accessible on Docker hub
+
+This image is automatically built and published into [Docker Hub](https://registry.hub.docker.com/u/apiman/cli/).