Update README.md

Author: Md-Emon-Hasan

README.md

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 # 🧠 AutoDocThinker: Intelligent Search Engine with Reasoning + Tool Usage Logic
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 ## 📌 Overview
 
 This project is an **AI-powered Question Answering Web App** that allows users to upload documents (PDF, DOCX, HTML) or provide URLs, and ask questions about the content. The system uses a **Retrieval-Augmented Generation (RAG)** architecture combined with **LangGraph** for structured reasoning, **Gemini LLM** for responses, and **ChromaDB** for vector storage.
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 MIT License — Free to use, share, and contribute.
 
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