Added Discrete Maths Course by IIT Ropar NPTEL

I found this course on discrete maths very interesting and helpful.
Video lectures are very short and presented very well and are easy to understand.
This course is conducted by IIT Ropar on NPTEL Platform.

README.md

@@ -274,7 +274,7 @@ Sometimes the classes are not in session so you have to wait a couple of months,
 ## Interview Process & General Interview Prep
 
 - [ ] [How to Pass the Engineering Interview in 2021](https://davidbyttow.medium.com/how-to-pass-the-engineering-interview-in-2021-45f1b389a1)
-- [x] [Whiteboarding](https://medium.com/@dpup/whiteboarding-4df873dbba2e#.hf6jn45g1)
+- [ ] [Whiteboarding](https://medium.com/@dpup/whiteboarding-4df873dbba2e#.hf6jn45g1)
 - [ ] [Demystifying Tech Recruiting](https://www.youtube.com/watch?v=N233T0epWTs)
 - [ ] How to Get a Job at the Big 4:
     - [ ] [How to Get a Job at the Big 4 - Amazon, Facebook, Google & Microsoft (video)](https://www.youtube.com/watch?v=YJZCUhxNCv8)
@@ -1783,6 +1783,7 @@ You're never really done.
     - [Computer Science 70, 001 - Spring 2015 - Discrete Mathematics and Probability Theory](http://www.infocobuild.com/education/audio-video-courses/computer-science/cs70-spring2015-berkeley.html)
     - [Discrete Mathematics by Shai Simonson (19 videos)](https://www.youtube.com/playlist?list=PLWX710qNZo_sNlSWRMVIh6kfTjolNaZ8t)
     - [Discrete Mathematics Part 1 by Sarada Herke (5 videos)](https://www.youtube.com/playlist?list=PLGxuz-nmYlQPOc4w1Kp2MZrdqOOm4Jxeo)
+    - [Discrete Mathematics By IIT Ropar NPTEL](https://nptel.ac.in/courses/106/106/106106183/)
 
 - ### Machine Learning
     - Why ML?