Update README.md

Author: bnasslahsen

README.md

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+[![Build Status](https://travis-ci.org/springdoc/springdoc-openapi-gradle-plugin.svg?branch=master)](https://travis-ci.org/springdoc/springdoc-openapi-gradle-plugin)
+[![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=springdoc_springdoc-openapi-gradle-plugin&metric=alert_status)](https://sonarcloud.io/dashboard?id=springdoc_springdoc-openapi-gradle-plugin)
+
 # **Introduction to springdoc-openapi-gradle-plugin**
 
 Spring Docs Open API Gradle Plugin - Generates OpenAPI-3 specification docs for spring boot application
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 # Building the plugin
 
-TODO
+TODO