add a user manual for this program

[DeveloppeurPascal]

use Help'n Doc (https://www.helpndoc.com) to obtain a PDF, ePub and website
use GitHub Pages (https://pages.github.com) to host the web version
add a link to the user manual web version in the FR/EN docs
add a link to the user manual web version in DelphiBooks-WebSite "database" FR/N docs