docs: add SonarQube badges

README.md

@@ -9,6 +9,9 @@
 [![Downloads](https://img.shields.io/github/downloads/Requarks/wiki/total.svg?style=flat)](https://www.npmjs.com/package/wiki.js)
 [![Docker Pulls](https://img.shields.io/docker/pulls/requarks/wiki.svg)](https://hub.docker.com/r/requarks/wiki/)  
 [![Build status](https://dev.azure.com/requarks/wiki/_apis/build/status/build)](https://dev.azure.com/requarks/wiki/_build/latest?definitionId=9)
+[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=Requarks_wiki&metric=alert_status)](https://sonarcloud.io/dashboard?id=Requarks_wiki)
+[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=Requarks_wiki&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=Requarks_wiki)
+[![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=Requarks_wiki&metric=security_rating)](https://sonarcloud.io/dashboard?id=Requarks_wiki)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/1d0217a3153c4595bdedb322263e55c8)](https://www.codacy.com/app/Requarks/wiki)
 [![Standard - JavaScript Style Guide](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](http://standardjs.com/)  
 [![Chat on Gitter](https://img.shields.io/badge/chat-on_gitter-CC2B5E.svg?style=flat&logo=image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAcAAAAOCAMAAADUg/YpAAAABlBMVEUAAAD///%2Bl2Z/dAAAAAXRSTlMAQObYZgAAABVJREFUeAFjwAUYYTQByAAh0WicAAAFnwAYeB5bLwAAAABJRU5ErkJggg==)](https://gitter.im/Requarks/wiki)