Added Cryptography Course (#10981)

* Added Cryptography Course

* Update free-courses-ur.md

* Update free-courses-ur.md

* Update free-courses-hi.md

courses/free-courses-hi.md

@@ -708,6 +708,7 @@
 ### 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 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
 * [Cyber Security Tutorials In HIndi](https://www.youtube.com/playlist?list=PL0fjgIGwLMWTFmZoLdEPoI9azA-osxcQj) - TechChip