Update README.md (#11)

Signed-off-by: Mitul Shah <[email protected]>

Author: MitulShah1

README.md

@@ -1,6 +1,7 @@
 # golang-rest-api-template
 [![license](https://img.shields.io/badge/license-MIT-green)](https://raw.githubusercontent.com/MitulShah1/golang-rest-api-template/main/LICENSE)
 [![build](https://github.com/MitulShah1/golang-rest-api-template//actions/workflows/go.yml/badge.svg?branch=main)](https://github.com/MitulShah1/golang-rest-api-template/actions/workflows/go.yml)
+[![codecov](https://codecov.io/github/MitulShah1/golang-rest-api-template/graph/badge.svg?token=88JSRODXSS)](https://codecov.io/github/MitulShah1/golang-rest-api-template)
 
 ## Overview
 This is a template for building production-ready and easily extendible REST API using Go. It follows best practices and includes a standardized project structure with all necessary components for building scalable microservices.