Documentation update

[frian]

Hi,

• moved "creating class by hand" in a separate file
• cleaned and simplified

questions/comments/suggestions ?

Hav a nice day !

[sstok]

Merged by 0b43a5df499f202170ba02d9d2a83e8bb125a1e5

Thank you @frian and sorry for the late merge.

[frian]

no worry :)