create dockerfile and docker-compose

Dockerfile

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+FROM node:8-onbuild AS build
+
+COPY . /app
+WORKDIR /app
+
+RUN npm install
+
+FROM node:8-alpine
+COPY --from=build /app /app
+WORKDIR /app
+
+CMD node app.js -p 3000

docker-compose.yml

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+version: "3.1"
+services:
+  wetty:
+    build: .
+    ports:
+      - "3000:3000"