Build Basic AI Tutor / Q&A Chatbot

# 🧠 Issue : Build Basic AI Tutor / Q&A Chatbot
**Labels:** `frontend`, `backend`, `ai-integration`, `good-first-issue`

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## 📋 Description

Develop a simple **AI Tutor Bot** that allows users to ask questions on a specific subject (e.g., Math, Biology) and get clear, easy-to-understand answers.
The bot should have a clean chat-style interface and communicate with an AI model (like OpenAI API or Hugging Face endpoint).

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## 🎯 Core Tasks

- [x] Create a **chat interface** (input box + message list).
- [x] Set up a **backend or API call** to handle questions and fetch AI responses.
- [x] Add a **subject filter** (e.g., select "Math" or "Biology").
- [x] Display AI responses in the chat window.
- [x] Handle loading and error states gracefully.

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## 💡 Tech Suggestions

**Frontend:** React / Next.js / HTML + CSS
**Backend (optional):** Node.js / Express
**AI API:** OpenAI / Hugging Face Inference API

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## 🚀 Future Enhancements

- [ ] Voice input (speech-to-text).
- [x] Save recent Q&A history.
- [x] Add support for multiple subjects.