Setup development environment

1. Install the latest Eclipse IDE for Java Developers (http://www.eclipse.org/downloads/)
2. Fork PMD (https://github.com/pmd/pmd)
3. Connect your eclipse with the master branch of your PMD repo
4. Import the project as general project
5. Delete the project, uncheck the Delete project contents on disk and copy the project location
6. Import them as existing Maven Projects and auto-resolve problems