Update README.md

Author: Lucs1590

README.md

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 # Coffee Recognition
 [![CI](https://github.com/Lucs1590/Coffee_Recognize/actions/workflows/main.yml/badge.svg?branch=master)](https://github.com/Lucs1590/Coffee_Recognize/actions/workflows/main.yml)
+[![codecov](https://codecov.io/gh/Lucs1590/Coffee_Recognize/branch/master/graph/badge.svg?token=GPOAW6KNKH)](https://codecov.io/gh/Lucs1590/Coffee_Recognize)
 [![TypeScript](https://badges.frapsoft.com/typescript/code/typescript.png?v=101)](https://github.com/ellerbrock/typescript-badges/)
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 [![Join the chat at https://gitter.im/Coffee_Recognize/community](https://badges.gitter.im/Coffee_Recognize/community.svg)](https://gitter.im/Coffee_Recognize/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)