Add: Dockerfile and Makefile

Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:latest as builder
+RUN wget http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz -O /tmp/GeoLite2-Country.tar.gz && \
+    cd /tmp && \
+    tar zxvf GeoLite2-Country.tar.gz && \
+    cd GeoLite2-Country_* && \
+    cp GeoLite2-Country.mmdb /Country.mmdb
+RUN curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh && \
+    mkdir -p /go/src/github.com/Dreamacro/clash
+WORKDIR /go/src/github.com/Dreamacro/clash
+COPY . /go/src/github.com/Dreamacro/clash
+RUN dep ensure && \
+    GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags '-w -s' -o /clash && \
+    chmod +x /clash
+
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates && \
+    mkdir -p /root/.config/clash
+COPY --from=builder /clash .
+COPY --from=builder /Country.mmdb /root/.config/clash/
+EXPOSE 7890 7891
+ENTRYPOINT ["/clash"]