update README.md

Author: RajMandaliya

README.md

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 A fully custom 16-bit CPU emulator written from scratch in Rust — including a complete Instruction Set Architecture (ISA), a two-pass assembler, and a CLI emulator.
 
-![CI](https://github.com/RajMandaliya/cpu16/actions/workflows/ci.yml/badge.svg)
 ![License](https://img.shields.io/badge/license-MIT-blue)
+![Rust](https://img.shields.io/badge/rust-async--first-orange.svg)
 
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