Update free-courses-hi.md - add graph resource hindi (#10852)

courses/free-courses-hi.md

@@ -86,6 +86,7 @@
 * [Generic Trees - Level 1](https://www.youtube.com/playlist?list=PL-Jc9J83PIiEmjuIVDrwR9h5i9TT2CEU_) - Pepcoding
 * [Graph Theory](https://www.youtube.com/playlist?list=PLxCzCOWd7aiG0M5FqjyoqB20Edk0tyzVt) - Gate Smashers
 * [Graphs - Level 1](https://www.youtube.com/playlist?list=PL-Jc9J83PIiHfqDcLZMcO9SsUDY4S3a-v) - Pepcoding
+* [Graphs - Level 2](https://www.youtube.com/playlist?list=PL-Jc9J83PIiEuHrjpZ9m94Nag4fwAvtPQ) - Pepcoding
 * [Hindi Data Structures And Algorithms Tutorial Python](https://www.youtube.com/playlist?list=PLPbgcxheSpE3NlJ30EDpxNYU6P2Jylns8) - codebasics Hindi
 * [Linked List - Level 1](https://youtube.com/playlist?list=PL-Jc9J83PIiF5VZmktfqW6WVU1pxBF6l_&si=S_MRPF7yyupBUCC6) - Pepcoding
 * [Recursion & Backtracking - Level 1](https://www.youtube.com/playlist?list=PL-Jc9J83PIiFxaBahjslhBD1LiJAV7nKs) - Pepcoding