added Dockerfile

Dockerfile

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+FROM golang:1.18-alpine AS builder
+WORKDIR /build
+RUN apk update && apk upgrade && apk add git
+COPY . /build/
+RUN go build
+
+FROM alpine:latest
+COPY --from=builder /build/multilog_exporter /multilog_exporter
+CMD ["sh", "-c", "/multilog_exporter --metrics.listen-addr ${MLEX_LISTEN:-0.0.0.0:9144} --config.file /mlex.yaml"]

README-docker.md

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+# Build a local docker image
+```
+docker build . -t yopur-repo/multilog-exporter:your-tag
+```
+
+# Run multilog_exporter
+```
+docker run -it -p 9144:9144 \
+  -v /var/log/:/logs/:ro \
+  -v $(pwd)/doc/example.yaml:/mlex.yaml:ro \
+  your-repo/multilog-exporter:your-tag
+```