Add a couple of undergrad courses from UC Davis (#271)

* Data structures course from UC Davis

Provides all the lecture and discussion videos for the entire quarter.

Signed-off-by: Joël Porquet-Lupine <joel@porquet.org>

* OS course from UC Davis

Provides all the lecture and discussion videos for the entire quarter.

Signed-off-by: Joël Porquet-Lupine <joel@porquet.org>

---------

Signed-off-by: Joël Porquet-Lupine <joel@porquet.org>

README.md

@@ -75,6 +75,7 @@ Table of Contents
 
 ### Data Structures and Algorithms
 
+- [ECS 36C - Data Structures and Algorithms (C++) - Spring 2020 - Joël Porquet-Lupine - UC Davis](https://lupteach.gitlab.io/courses/ucd-ecs36c/online/)
 - [Programming and Data Structures with Python, 2021-2022, Sem I - by Prof. Madhavan Mukund, CMI](https://www.cmi.ac.in/~madhavan/courses/python2021sep/)
 - [6.006 - Introduction to Algorithms, MIT OCW](https://ocw.mit.edu/courses/6-006-introduction-to-algorithms-spring-2020/video_galleries/lecture-videos/)
 - [Algorithms: Design and Analysis 1 - Stanford University](https://www.youtube.com/playlist?list=PLXFMmlk03Dt7Q0xr1PIAriY5623cKiH7V)
@@ -137,6 +138,7 @@ Table of Contents
 - [Systems - Aduni](http://aduni.org/courses/systems/index.php?view=cw)
 - [CS110: Principles of Computer Systems - Stanford](https://web.stanford.edu/class/archive/cs/cs110/cs110.1202/)
 - **Operating Systems**
+  - [ECS 150 - Operating Systems and Systems Programming - Fall 2020 - Joël Porquet-Lupine - UC Davis](https://lupteach.gitlab.io/courses/ucd-ecs150/online/)
   - [CS124 Operating Systems - California Institute of Technology, Fall 2018 - Youtube](https://www.youtube.com/playlist?list=PL3swII2vlVoVbav6FV98pidq6BsTN4u56)
   - [CS 162 Operating Systems and Systems Programming, Spring 2015 - University of California, Berkeley](https://archive.org/details/ucberkeley-webcast-PL-XXv-cvA_iBDyz-ba4yDskqMDY6A1w_c?sort=titleSorter)
   - [CS 4414 - Operating Systems, University of Virginia (rust-class)](http://rust-class.org/pages/classes.html)