added Dockerfile

Author: xImAnton

Dockerfile

@@ -0,0 +1,10 @@
+FROM node:12.18.3
+
+WORKDIR /app
+COPY ["package.json", "package-lock.json*", "./"]
+RUN npm install --production
+COPY . .
+RUN npm run build
+
+EXPOSE $CLIENT_PORT
+CMD ["node", "server.js"]