add french c++ course (#6181)
* add french c++ course * fix blankline linting * Update courses/free-courses-fr.md Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com> * add to index Co-authored-by: Nx0rld <git@x0rld.eu> Co-authored-by: NDavid Ordás <3125580+davorpa@users.noreply.github.com>
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