add license badge

Author: kaya70875

README.md

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 # YTFetcher
 [![codecov](https://codecov.io/gh/kaya70875/ytfetcher/branch/main/graph/badge.svg)](https://codecov.io/gh/kaya70875/ytfetcher)
 [![PyPI version](https://img.shields.io/pypi/v/ytfetcher)](https://pypi.org/project/ytfetcher/)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+
+> ⚡ Effortlessly fetch and convert YouTube transcripts for ML, research, or personal use.
 
 **YTFetcher** is a Python tool for fetching YouTube video transcripts in bulk, along with rich metadata like titles, publish dates, and descriptions. Ideal for building NLP datasets, search indexes, or powering content analysis apps.