Addition of sample solution for A4, written by Emily Horsman

Assignments/A4/A4Soln/Makefile

Assignments/A4/A4Soln/bin/.gitkeep

Assignments/A4/A4Soln/catch/catch.h

Assignments/A4/A4Soln/doxConfig

Assignments/A4/A4Soln/experiment/main.cpp

Assignments/A4/A4Soln/include/CardADT.h

Assignments/A4/A4Soln/include/Exceptions.h

Assignments/A4/A4Soln/include/GameADT.h

Assignments/A4/A4Soln/include/GameTypes.h

Assignments/A4/A4Soln/include/StackADT.h

Assignments/A4/A4Soln/spec/NomenclatureDiagram.png

Assignments/A4/A4Soln/spec/spec.pdf

Assignments/A4/A4Soln/spec/spec.tex

Assignments/A4/A4Soln/src/CardADT.cpp

Assignments/A4/A4Soln/src/GameADT.cpp

Assignments/A4/A4Soln/src/README.md

Assignments/A4/A4Soln/src/StackADT.cpp

Assignments/A4/A4Soln/test/testCardADT.cpp

Assignments/A4/A4Soln/test/testGameADT.cpp

Assignments/A4/A4Soln/test/testStackADT.cpp