Update README.md

Author: victorhsr

README.md

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 # Hermes Maven Plugin
 [![Maven Build](https://github.com/victorhsr/hermes-maven-plugin/workflows/Maven%20Build/badge.svg)](https://github.com/victorhsr/hermes-maven-plugin/actions?query=workflow%3A"Maven+Build")
 [![Coverage Status](https://coveralls.io/repos/github/victorhsr/hermes-maven-plugin/badge.svg)](https://coveralls.io/github/victorhsr/hermes-maven-plugin)
+[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/mit)
 
 Hermes is a Maven plugin designed to streamline the generation of fluent object builders for your Java classes. Employing a declarative approach, it produces a straightforward Domain Specific Language (DSL) to facilitate the construction of object instances.