Se agrega Codefactor icon

Author: gbrayhan

README.md

@@ -3,6 +3,7 @@
 [![forks](https://img.shields.io/github/forks/gbrayhan/microservices-go)](https://github.com/gbrayhan/microservices-go/network/members)
 [![stars](https://img.shields.io/github/stars/gbrayhan/microservices-go)](https://github.com/gbrayhan/microservices-go/stargazers)
 [![license](https://img.shields.io/github/license/gbrayhan/microservices-go)](https://github.com/gbrayhan/microservices-go/tree/master/LICENSE)
+[![CodeFactor](https://www.codefactor.io/repository/github/gbrayhan/microservices-go/badge/master)](https://www.codefactor.io/repository/github/gbrayhan/microservices-go/overview/master)
 
 Example structure to start a microservices project with golang. Using a MySQL database.