[py] add __slots__ into Runtime
[py] init Design Pattern (State Machine)
[py] add Find into Runtime
[py] add Sort into Runtime
[py] add Generator Type into Loop Techniques of Runtime
[py] add Visitor into Design Pattern
[py] add Factory into Design Pattern
[py] init gitignore (.py[co])
[py] init Testing (Doctesting)
[py] update README for Design Pattern
[py] update README for Testing
[py] update README for more details on Design Pattern and Testing