Add Dockerfile and package.json for simple Express server

simple-express-server/Dockerfile

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+FROM node:14
+
+WORKDIR /app
+
+COPY package*.json /app
+RUN yarn install
+EXPOSE 8001
+
+CMD [ "yarn", "start" ]

simple-express-server/README.md

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+# Simple Express Server
+
+This is a simple Express server that listens on port 8001. It does not have any endpoints defined.
+
+## Prerequisites
+
+- Node.js
+- Yarn
+
+## Getting Started
+
+1. Clone the repository:
+
+   ```bash
+   git clone https://github.com/your-username/simple-express-server.git
+   ```
+
+2. Install the dependencies:
+
+   ```bash
+   cd simple-express-server
+   yarn install
+   ```
+
+3. Start the server:
+
+   ```bash
+   yarn start
+   ```
+
+   The server will be running at http://localhost:8001.
+
+## Docker
+
+To run the server using Docker, follow these steps:
+
+1. Build the Docker image:
+
+   ```bash
+   docker build -t simple-express-server .
+   ```
+
+2. Run the Docker container:
+
+   ```bash
+   docker run -p 8001:8001 simple-express-server
+   ```
+
+   The server will be accessible at http://localhost:8001.
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.
+```
+
+Please note that you need to replace `your-username` in the clone command with your actual GitHub username.

simple-express-server/package.json

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+{
+  "name": "simple-express-server",
+  "version": "1.0.0",
+  "description": "A simple Express server",
+  "main": "src/app.js",
+  "scripts": {
+    "start": "nodemon src/app.js"
+  },
+  "dependencies": {
+    "express": "^4.17.1"
+  },
+  "devDependencies": {
+    "nodemon": "^2.0.12"
+  },
+  "engines": {
+    "node": ">=12.0.0"
+  }
+}

simple-express-server/src/app.js

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+const express = require('express');
+const app = express();
+
+const PORT = 8001;
+
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}`);
+});