Create design_prototype_decent.py

Worked on my design skills on paper and traced program execution on paper. This really helped me to come up with a working prototype.

linux:~> ./design_prototype_decent.py --debug

Test // | Help | Quit
Welcome to the application
>>>
Test // | Help | Quit
Welcome to the application
>>>
Test // | Help | Quit
Welcome to the application
>>> help
Test // | Help | Quit
Welcome to the application
>>> quit
Test // | Help | Quit
Welcome to the application
>>> Bye bye