Update free-courses-hi.md (#9972)

* Update free-courses-hi.md

Added Software Engineering course

* Update free-courses-hi.md

* Update courses/free-courses-hi.md

Co-authored-by: Eric Hellman <eric@hellman.net>

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Co-authored-by: Eric Hellman <eric@hellman.net>

courses/free-courses-hi.md

@@ -593,6 +593,7 @@
 ### Software Engineering
 
 * [Software Engineering](https://www.youtube.com/playlist?list=PLxCzCOWd7aiEed7SKZBnC6ypFDWYLRvB2) - Gate Smashers
+* [Software Engineering](https://www.youtube.com/playlist?list=PLmXKhU9FNesTrw7n8ouPsSLEcduRlENHr) - Knowledge Gate
 * [Software Engineering Lectures](https://youtube.com/playlist?list=PLV8vIYTIdSnat3WCO9jfehtZyjnxb74wm) - Easy Engineering Classes