Add docker files

Dockerfile

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+FROM golang:1.7.1
+
+# Copy the runtime dockerfile into the context as Dockerfile
+COPY Dockerfile.run /go/bin/Dockerfile
+COPY ./www /go/bin/www
+
+COPY . /go/src/github.com/franela/play-with-docker
+
+WORKDIR /go/src/github.com/franela/play-with-docker
+
+RUN go get -v -d ./...
+
+RUN CGO_ENABLED=0 go build -a -installsuffix nocgo -o /go/bin/play-with-docker .
+
+# Set the workdir to be /go/bin which is where the binaries are built
+WORKDIR /go/bin
+
+# Export the WORKDIR as a tar stream
+CMD tar -cf - .