Add french traduction

Adds french traduction for read me and summary.
Translate Intro and requirements

Translate Intro and requirements
Final touches

Translated the local network test to French, and updated the
screenshots for improved readability.
Oups

Forgot one picture
minor corrections for the French translation
Merge pull request #1 from frabrunelle/master

minor corrections for the French translation
Merge pull request #4 from lejacobroy/master

Merging French translation for Local Network setup example.