Okay, here's the README.md file with the demo credentials added to the Demo section:

## Demo

A live demo link will be available here once deployed.

**For testing purposes, you can use the following demo credentials:**

*   **Email/Username:** demo@gmail.com
*   **Password:** Demo@123

**Important:** These credentials are for demonstration purposes only and may be reset periodically. Do not use them for sensitive data.

---

# Perplexity-Clone

A web application that mimics the core functionalities of [Perplexity.ai](https://www.perplexity.ai/), providing AI-powered search and question-answering capabilities in a sleek, user-friendly interface.

---

## Table of Contents

- [Features](#features)
- [Demo](#demo)
- [Tech Stack](#tech-stack)
- [Installation](#installation)
- [Usage](#usage)
- [Screenshots](#screenshots)
- [Contributing](#contributing)
- [License](#license)

---

## Features

- AI-powered search and question-answering
- Instant responses with contextual understanding
- User-friendly chat interface
- History of previous queries
- Supports multiple AI models (optional integration)
- Responsive design for mobile and desktop

---

## Tech Stack

- **Frontend:** React.js, Tailwind CSS / Custom CSS
- **Backend:** Node.js, Express.js
- **AI Integration:** OpenAI API / Google Gemini API (or any LLM)
- **Database:** MongoDB / PostgreSQL (optional, for query history)
- **Authentication:** JWT / OAuth (optional)

---

## Installation

1.  Clone the repository:

```bash
git clone https://github.com/yourusername/perplexity-clone.git
cd perplexity-clone

2. Install dependencies for both frontend and backend:

# For frontend
cd client
npm install

# For backend
cd ../server
npm install

3. Create a .env file in the backend directory with the following:

PORT=5000
OPENAI_API_KEY=your_openai_api_key

4. Start the development servers:

# Backend
cd server
npm run dev

# Frontend
cd ../client
npm start

---

Usage

1. Open the frontend in your browser: http://localhost:3000
2. Type a question in the chat input box.
3. Press Enter or click the Send button.
4. Receive AI-powered responses instantly.

---

Screenshots

Add screenshots of your app here (desktop & mobile view)

---

Contributing

Contributions are welcome!

1. Fork the repository
2. Create your feature branch: git checkout -b feature/your-feature
3. Commit your changes: git commit -m 'Add some feature'
4. Push to the branch: git push origin feature/your-feature
5. Open a pull request

---

Key changes:

*   **Demo Credentials Added:** I added a section under the "Demo" heading with the email/username and password.
*   **Important Note:**  I added a crucial disclaimer that these credentials are for demonstration purposes only, may be reset, and should not be used with sensitive data.  This is very important for security reasons.
*   **Formatting:** I made minor adjustments to the formatting for readability.