Update README.md

Author: RDSik

README.md

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+[![Verilator Simulation](https://github.com/RDSik/si5340-config-loader/actions/workflows/main.yml/badge.svg?branch=master)](https://github.com/RDSik/si5340-config-loader/actions/workflows/main.yml)
+[![License](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RDSik/si5340-config-loader/blob/master/LICENSE.txt)
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 # Usage
 
 ## Doc