Add french javascript course (#5879)

* add french javascript course

* fix url
Co-authored-by: Nx0rld <git@x0rld.eu>

courses/free-courses-fr.md

@@ -76,6 +76,7 @@
 * [Apprendre le JavaScript](https://www.youtube.com/playlist?list=PLjwdMgw5TTLVzD9Jq_WBd1crqDwXRn4cw) - Grafikart
 * [Cours JavaScript](https://www.youtube.com/playlist?list=PLrSOXFDHBtfGxf_PtXLu_OrjFKt4_dqB_) - Formation Video
 * [Déboguer son code JavaScript](https://www.youtube.com/playlist?list=PLjwdMgw5TTLWWXgsHpfCLHJ1Oq4YnE08e) - Grafikart
+* [Tutoriel de javascript moderne](https://fr.javascript.info) - javascript.info
 * [TUTOS JS](https://www.youtube.com/playlist?list=PLEagTQfI6nPPVSKoYo2p8Cf8eijcyz5t9) - PrimFX