Added Express.js example

node-express/Dockerfile

@@ -0,0 +1,16 @@
+FROM node:alpine
+
+# Set the working directory in the container
+WORKDIR /usr/src/app
+
+# Copy the package.json and package-lock.json files
+COPY package*.json ./
+
+RUN npm install
+
+COPY . .
+
+EXPOSE 5000
+
+# Define the command to run the app
+CMD ["node", "app.js"]