Add first elements

Structure
plan
preambule
introduction
Add last modify
Add first chapter
Correct few typos

Correct content.yml path
Correct a sentence
family-properties
Correct some typos
First version of cycle de vie
Update

Integrate marc modification (api toc generation)
Modify cycle de vie text
Few typos corrections
add attr properties
add API title and intro
use api elements for api pages
correct book description
mv introduction_dynacase.md -> Introduction_dynacase/intro.md
initialize plan
Merge pull request #1 from CircleCode/private/3.2

Yes! Enfin .....
mise à jour de la liste des API
init preamble
typo correction
rename all intro.md into introduction.md
api level 2 is tocable, use chapter element