Add docker

docker/Dockerfile

@@ -0,0 +1,15 @@
+#
+# BUILD: docker build --rm -t derand/node-websocket-vs-socket.io -f ./docker/Dockerfile .
+#   RUN: docker run --detach=true -p 3001:3001 -p 3002:3002 --name node-websocket-vs-socket.io derand/node-websocket-vs-socket.io
+#
+
+FROM       node
+
+COPY . /node-websocket-vs-socket.io/
+WORKDIR /node-websocket-vs-socket.io/
+
+RUN  npm i
+
+EXPOSE 3001 3002
+
+ENTRYPOINT ["./ws-vs-si.js"]

docker/docker-compose.yml

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+#
+# docker-compose -f ./docker/docker-compose.yml build
+# docker-compose -f ./docker/docker-compose.yml up -d
+#
+
+version: '2'
+services:
+  node-websocket-vs-socket.io:
+    image: "derand/node-websocket-vs-socket.io"
+    build: 
+      context: ../
+      dockerfile: ./docker/Dockerfile
+    container_name: node-websocket-vs-socket.io
+    hostname: node-websocket-vs-socket.io
+    ports:
+      - "3001:3001"
+      - "3002:3002"