Update free-courses-hi.md (#7787)

added resource for system analysis and design

courses/free-courses-hi.md

@@ -389,6 +389,7 @@
 
 ### System Design
 
+* [System Analysis and Design](https://www.youtube.com/playlist?list=PLi81x6d2Os_8Sa8HifiFruWK6wmgG3Wrg) - Gursimran Singh Dhillon
 * [System Design](https://www.youtube.com/playlist?list=PLMCXHnjXnTnvo6alSjVkgxV-VH6EPyvoX) - Gaurav Sen
 * [System Design Primer Course](https://www.youtube.com/playlist?list=PLTCrU9sGyburBw9wNOHebv9SjlE4Elv5a) - sudoCODE