Add Docker

Dockerfile

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+FROM golang:latest
+EXPOSE 42000
+
+# Set go bin which doesn't appear to be set already.
+ENV GOPATH /go
+
+ARG REPO_PATH=github.com/garritfra/blockchain-project
+
+# build directories
+RUN mkdir /app
+RUN mkdir -p /go/src/${REPO_PATH}
+ADD . /go/src/${REPO_PATH}
+WORKDIR /go/src/${REPO_PATH}
+
+# Build my app
+RUN go install
+RUN go build
+CMD ["/go/bin/blockchain-project"]
+