[Platform] - Create the Platform interface class

[Waterfountain10]

What to do:

• since we might use CLI or GUI, create the interface for cross-platform in platform.h and .cpp
• init()
• render()
• processInput(),
• waitFrame()

NO need to implement everything just stub it with print() or std::COUT

Criteria:

• compiles well and stubs messages @ each frame
• Platforms methods are accessible in main.cpp (which will allow to complete the rest of the parent's issue [CORE] - Create Platform Layer and a demo working main loop #6 )