Added Bangla SQL Programming Book (#9645)

* Added Bangla SQL Programming Book

* Fixed trailing slash in the URL

books/free-programming-books-bn.md

@@ -73,4 +73,5 @@
 ### Sql
 
 * [এসকিউএল পরিচিতি(SQL Introduction in Bangla)](https://www.sattacademy.com/sql/sql-intro.php) - Satt Academy
+* [বাংলায় SQL টিউটোরিয়াল](https://sql.howtocode.dev) - Saiful, et al.