Update README.md

Author: mtharrison

README.md

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 # 🦀🎄 Advent of Code 2024
 
-![build](https://github.com/mtharrison/advent-of-code2024/actions/workflows/rust.yml/badge.svg)
+![build](https://github.com/mtharrison/advent-of-code2024/actions/workflows/rust.yml/badge.svg) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
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