Add Sonarqube

Adds Sonarqube based on the feedback of James Perkin via https://dev.to/perkinsjr/comment/8a17.

Author: streichsbaer

README.md

@@ -34,6 +34,7 @@ Supported by: [GuardRails.io](https://www.guardrails.io)
 - [Find Security Bugs](https://github.com/find-sec-bugs/find-sec-bugs/) - SpotBugs plugin for security audits of Java web applications and Android applications.
 - [Detect Secrets](https://libraries.io/pypi/detect-secrets) - An enterprise friendly way of detecting and preventing secrets in code.
 - [Gitrob](https://github.com/michenriksen/gitrob) - Gitrob is a tool to help find potentially sensitive files pushed to public repositories on Github.
+- [Sonarqube](https://github.com/SonarSource/sonarqube) - SonarQube provides the capability to show the health of an application and highlight newly introduced issues.
 
 ## Runtime Analysis