Adds Cryptography and network security playlist in Hindi (Changes Made) (#11400)

* Adds Cryptography and network security playlist in hindi

* Corrected the playlist link

courses/free-courses-hi.md

@@ -732,6 +732,7 @@
 ### Security
 
 * [Complete Ethical Hacking Tutorial for Beginners to Pro 2022](https://www.youtube.com/playlist?list=PLjVLYmrlmjGea8U9nphmCHGK_v6p_wq-R) - WsCube Tech
+* [Cryptography and network security](https://www.youtube.com/playlist?list=PL9FuOtXibFjV77w2eyil4Xzp8eooqsPp8) - Abhishek Sharma
 * [Cryptography and Network Security Lecture in Hindi / Urdu for Beginners](https://youtube.com/playlist?list=PLE3bzAX_OzbkQXKbRFqQqbnlGxTNeaUqe) - Katoon Studio
 * [cyber security course for beginners - Urdu/Hindi](https://www.youtube.com/playlist?list=PLKJfBg0XdWkevCEJ64RK11LylBNX2-zbk) - hashintelligence
 * [Cyber Security Tutorial In Hindi](https://www.youtube.com/playlist?list=PL-JvKqQx2AteIbm-z4X709scVr9OaHpIY) - University Academy