Added a rudimentary but working AddDefectPanel. I've tested it with a makeshift tester class and was able to add a new defect to the db.

It just needs to be hooked up to the add defect button and a dialog. The
submit button doesn't have a separate controller class though. The
cancel button also doesn't work yet. Other changes include making
priority a String instead of integer and revising the addDefect method
in DefectDAO.