Add dockerfile

Dockerfile

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+FROM golang:1.13.6-alpine3.11 as builder
+
+WORKDIR /go/src/app
+
+COPY . .
+
+# There is a roblem with net lib bindings and CGO_ENABLED is needed
+# https://stackoverflow.com/questions/36279253/go-compiled-binary-wont-run-in-an-alpine-docker-container-on-ubuntu-host
+RUN CGO_ENABLED=0 go build -o server -v .
+
+# ==============================
+# Stage 2: Run the isolated build in a lightweight image
+# ==============================
+
+FROM alpine:3.11
+
+WORKDIR /app
+
+EXPOSE 8100
+
+ENTRYPOINT ["/app/server"]
+CMD ["-p", "8100", "-d", "/files"]
+
+COPY statics/ ./statics
+COPY templates/ ./templates
+COPY --from=builder /go/src/app/server ./
+
+VOLUME /files