Update free-courses-en.md (#7786)

* Update free-courses-en.md

Added digital electronics resource

* Update free-courses-en.md

made suggested changes

courses/free-courses-en.md

@@ -426,6 +426,7 @@
 ### Digital Electronics
 
 * [Digital Electronics](https://www.youtube.com/playlist?list=PLBlnK6fEyqRjMH3mWf6kwqiTbT798eAOm) - Neso Academy
+* [Digital Electronics for GATE](https://www.youtube.com/playlist?list=PLWPirh4EWFpHk70zwYoHu87uVsCC8E2S-) - Tutorials Point India Ltd.
 
 
 ### Docker