Added Dockerfile.

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:8.15.0 as build
+
+WORKDIR /ngn4
+
+COPY . /ngn4/
+RUN rm -rf data node_modules .git Dockerfile screenlog.0 access.log
+
+RUN npm install
+
+FROM node:8.15.0 as dist
+
+COPY --from=0 /ngn4 /ngn4
+WORKDIR /ngn4
+
+CMD ["/usr/local/bin/node", "."]