add interface of Coordinate class, issue #78
add class properties of Coordinate class, issue #78
implement setPolarCoordinate, issue #78
Coordinates class, angle is in degrees, issue #78
Coordinates class, implement Polar getters, issue #78
Coordinates class, return 0 angle if radius is 0, issue #78
add test for Coordinate class, issue #78
add todos
Merge branch 'master' into coordinates
add setCoordinate method, issue #78
add Constructor that takes a Coordinate instance as a parameter, issue #78
reorder tests
switch order of Polar coordinate parameters : radius, angle; issue #78
fix typo [skip ci]
wrap long line
implement setCartesianCoordinates, issue #78
test Constructor with Cartesian coordinates as parameters, issue #78
fix coding style
implement getCartesianX/Y, issue #78
test Cartesian to Cartesian conversion, issue #78