updated the whole structure

app-rappaurio/Dockerfile

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+# pull the Node.js Docker image
+FROM node:alpine
+
+# create the directory inside the container
+WORKDIR /usr/src/app
+
+# copy the package.json files from local machine to the workdir in container
+COPY package*.json ./
+
+# run npm install in our local machine
+RUN npm install
+
+# copy the generated modules and all other files to the container
+COPY . .
+
+# our app is running on port 5000 within the container, so need to expose it
+EXPOSE 5000
+
+# the command that starts our app
+CMD ["npm", "start"]