Update free-courses-hi.md (#8326)

Added a course on Graph data structure

courses/free-courses-hi.md

@@ -164,6 +164,7 @@
 * [Dynamic Programming Playlist](https://www.youtube.com/playlist?list=PL_z_8CaSLPWekqhdCPmFohncHwz8TY2Go) - Aditya Verma
 * [Dynamic Programming Workshop](https://www.youtube.com/playlist?list=PLqf9emQRQrnKA_EeveiXQj_uP25w8_5qL) - Vivek Gupta
 * [Functions and Arrays - Level 1](https://www.youtube.com/playlist?list=PL-Jc9J83PIiHOV7lm2uSw4ZiVsIRsGS6r) - Pepcoding
+* [Graph Data Structure & Algorithms Full Course In Hindi](https://www.youtube.com/playlist?list=PLzjZaW71kMwSrxEtvK5uQnfNQ9UjGGzA-) - Hello World
 * [Graph Series by Striver \| C++ \| Java \| Interview Centric \| Algorithms \| Problems](https://www.youtube.com/playlist?list=PLgUwDviBIf0oE3gA41TKO2H5bHpPd7fzn) - take U forward
 * [Java + Data Structures + Algorithms](https://www.youtube.com/playlist?list=PLKKfKV1b9e8ps6dD3QA5KFfHdiWj9cB1s) - Apni Kaksha
 * [Java + DSA](https://www.youtube.com/playlist?list=PLfqMhTWNBTe3LtFWcvwpqTkUSlB32kJop) - Apna College (YouTube)