Hindi/ हिंदी Language Added and some of its resources (#3805)

* Hindi language section added

* Hindi Free Courses Added

* Update free-programming-books-hn.md

* removed empty files

Co-Authored-By: Dwarkesh Kaswala <71209082+dwarcash@users.noreply.github.com>

* renamed hn to hi for hindi as per ISO

Co-Authored-By: Dwarkesh Kaswala <71209082+dwarcash@users.noreply.github.com>

* Hindi / हिंद language added

Co-Authored-By: Dwarkesh Kaswala <71209082+dwarcash@users.noreply.github.com>

* playlists removed and added one single video links

Co-Authored-By: Dwarkesh Kaswala <71209082+dwarcash@users.noreply.github.com>

* "playlist" links added and "full course in one video" links added

Co-Authored-By: Dwarkesh Kaswala <71209082+dwarcash@users.noreply.github.com>

Co-authored-by: Dwarkesh Kaswala <dwarkeshkaswala777@gmail.com>

README.md

@@ -66,6 +66,7 @@ Please read [CONTRIBUTING](/CONTRIBUTING.md). If you're new to GitHub, [welcome]
 + [English](free-courses-en.md)
 + [Finnish](free-courses-fi.md)
 + [German / Deutsch](free-courses-de.md)
++ [Hindi / हिंदी](free-courses-hi.md)
 + [Indonesian / Bahasa Indonesia](free-courses-id.md)
 + [Italian / italiano](free-courses-it.md)
 + [Korean / 한국어 [韓國語]](free-courses-ko.md)