Add Sonar analysis to project

[ljacqu]

It would be useful to run Sonar over this project and get its results. CodeClimate has a plugin at https://github.com/codeclimate/codeclimate-sonar-java, but it seems pretty dead and from what I've understood, it doesn't allow any configurations.

Maybe time to ditch CodeClimate—Checkstyle rules could be enforced by its Maven plugin, and there may be another code analysis service that provides something beyond Checkstyle. The way that we use it now, CodeClimate is nothing more than a container that runs Checkstyle, and I'm not sure what more it would provide that is of interest for us.

[gamerover98]

You can use SonarLint