Calculadora Command + Memento class diagram added
Calculadora Memento tests implemented
Mementable inteface added
MementoCalculadora class added
CalculadoraMementable added
GestorMementos added
ComandoGuardar & ComandoDeshacer added
GuardarComandoMock & DeshacerComandoMock added
Test bug resolved
Test are running successfully
MainCalculadora modified for adding Guardar/Deshacer funtionalities