Added Hindi playlist for learning SQL. (#9936)

* Added link of YouTube palylist for Core Java Interview Questions.

* Updated Youtube Playlist for Java resource.

* Added YouTube video resource for Spring Boot Complete Tutorial.

* Changes added as per PR review comment.

* Added Microservice tutorial in Hindi.

* Added PDF resource for Java Design Patterns.

* Added Hindi course for SQL.

* Added space.

courses/free-courses-hi.md

@@ -219,6 +219,7 @@
 * [DBMS (Database Management System) Complete Playlist](https://www.youtube.com/playlist?list=PLxCzCOWd7aiFAN6I8CuViBuCdJgiOkT2Y) - Gate Smashers
 * [DBMS Lectures in Hindi](https://www.youtube.com/playlist?list=PL0s3O6GgLL5dg3bZhTicr5zUITPAlZNjj) - Last moment tuitions 
 * [DBMS Placements Series 2022](https://www.youtube.com/playlist?list=PLDzeHZWIZsTpukecmA2p5rhHM14bl2dHU) - CodeHelp - by Babbar
+* [SQL Tutorial in Hindi](https://www.youtube.com/playlist?list=PLdOKnrf8EcP17p05q13WXbHO5Z_JfXNpw) - Rishabh Mishra
 
 
 ### DevOps