Update README.md

Author: ThatGuyNick05

README.md

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 # Workflow-Testing
 
 ![CI](https://github.com/ThatGuyNick05/Workflow-Testing/actions/workflows/ci.yml/badge.svg?branch=main)
+![Coverage](https://img.shields.io/badge/Coverage-100%25-brightgreen?style=flat-square)
+
 
 This repository exists purely as a demonstration of an integrated development workflow.