Update free-courses-en.md (#2269)

* Update free-courses-en.md

I built this search engine for my own research into software architecture, but I suspect it might be helpful to others.

* Update free-courses-en.md

* Update free-courses-en.md

free-courses-en.md

@@ -209,6 +209,7 @@
 * [Berkeley's Math 10B: Methods of Mathematics: Calculus, Statistics, and Combinatorics](https://www.youtube.com/view_play_list?p=-XXv-cvA_iCZ8sTG0pDuBubsDfOFoY2X)
 * [Bits: The Computer Science of Digital Information](http://www.extension.harvard.edu/open-learning-initiative/bits)
 * [Computer Graphics](http://nptel.ac.in/courses/106106090/)
+* [FindLectures.com](https://www.findlectures.com/?class1=Technology) - Index of conference talks by language / topic
 * [LouvainX Paradigms of Computer Programming – Abstraction and Concurrency](https://www.edx.org/course/paradigms-computer-programming-louvainx-louv1-2x-1#!)
 * [LouvainX Paradigms of Computer Programming – Fundamentals ](https://www.edx.org/course/paradigms-computer-programming-louvainx-louv1-1x-1)
 * [MIT Numerical Methods (2014)](http://www.iitg.ernet.in/kartha/CE601-14/CourseSchedule.htm)