Add Dockerfile for Windows Server 2019

Dockerfile.1809

@@ -0,0 +1,17 @@
+ARG golang=chocolateyfest/golang
+ARG target=mcr.microsoft.com/windows/nanoserver:1809
+
+FROM $golang AS build
+
+COPY . /code
+WORKDIR /code
+
+RUN go build http.go
+
+FROM $target
+
+COPY --from=build /code/http.exe /http.exe
+
+EXPOSE 8080
+
+CMD ["\\http.exe"]