Nw files hierarchy

Header, Sources, Assets folders added
ScreenSaver class added
README Updated

Settings notes added
Settings class updated

delay attribute added
ASection abstact class updated

2 pure methods added
- Draw()
- Update()
Image for README.md
Cubes apparition modes in progress
Cubes apparrition updated

Test with some animations, settings in progress
Cleaning.
Assets updated

Demo WIP.png updataed
WIP.png added