Added Figure interface and RectangleTest with Rectangle, tests fail
Forgot to make RectangleTest public
Added Square, I should consider using rectangle as a base
Added getter Methods and use these in tests
Added circle figure
Added constructer with parameters for all shapes
Convert Figure to abstract base class and implement isValueValid method
Implementet InvalidValueException + NegativeValueException, ...
- Added validity checks to circle
Added test and valid check for Rectangle
Implement validity check to square
Implemented some shapes. This closes #2