add sql course (#4897)

* add sql course

* add react free course

* Revert "add react free course"

This reverts commit 3607c3b935d508d55a3df69405ad28d1c8e8f3d1.

* Update free-courses-vi.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

free-courses-vi.md

@@ -190,6 +190,7 @@
 
 * [SQL Cơ Bản](https://www.codehub.com.vn/SQL-Co-Ban)
 * [SQL Cơ Bản](https://www.youtube.com/watch?v=2fanjSYVElY&list=PL33lvabfss1xnFpWQF6YH11kMTS1HmLsw) - Kteam
+* [Học SQL Cơ Bản](https://www.youtube.com/playlist?list=PLE1qPKuGSJaDkQQB5vK7t7-PRIVjtqeHB) - thân triệu
 
 
 ### Swift