add dockerfile and running instructions

Dockerfile

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+FROM golang:1.13.15-alpine3.12 AS build
+WORKDIR /app
+# COPY go.mod go.sum .
+# ^^ add go.sum when you will need modules
+COPY go.mod .
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o ./out/app .
+
+FROM gcr.io/distroless/static-debian10
+COPY --from=build /app/out/app /usr/local/bin/app
+ENTRYPOINT ["/usr/local/bin/app"]

run.sh

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+docker run kafka-metrics:latest \
+  --prometheus-url http://10.130.0.35:9090 \
+  --partition-size-query 'max(kafka_log_log_size{kafka_cluster="kafka-mailings-dm-stable"}) by (topic,partition)' \
+  --broker-storage-query 'node_filesystem_avail_bytes{node_group="kafka-mailings-dm-stable", mountpoint=~"/var/lib/kafka.*"}' \
+  --broker-id-label instance \
+  --broker-id-map "kafka-mailings-dm-stable-a-1-v1=1,kafka-mailings-dm-stable-a-2-v1=4,kafka-mailings-dm-stable-b-1-v1=2,kafka-mailings-dm-stable-b-2-v1=5,kafka-mailings-dm-stable-c-1-v1=3,kafka-mailings-dm-stable-c-2-v1=6" \
+  --zk-addr 10.145.0.214:2181 \
+  --prometheus-query-timeout 300s