adding resources in free-courses-en.md (#6527)

* adding resources in free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

courses/free-courses-en.md

@@ -251,6 +251,7 @@
 
 ### Compilers
 
+* [Compilers](https://www.youtube.com/playlist?list=PL6KMWPQP_DM97Hh0PYNgJord-sANFTI3i) - Ghassan Shobaki (YouTube)
 * [Stanford's Compilers](https://www.edx.org/course/compilers)
 
 
@@ -684,6 +685,7 @@
 * [Data Processing and Feature Engineering with MATLAB](https://www.coursera.org/learn/feature-engineering-matlab) (coursera)
 * [Introduction to Matlab in English](https://www.youtube.com/playlist?list=PLGED90Y_uL1KLpdRmVtwfpNoYCWU9RPkK) -Mohammed Mohammed
 * [MATLAB and Simulink Training](https://matlabacademy.mathworks.com)
+* [MATLAB Programming for Numerical Computation NPTEL](https://www.youtube.com/playlist?list=PLRWKj4sFG7-6_Xr9yqg6SMr_F80KdFVhN) - Niket Kaisare NPTEL (YouTube)
 * [MIT 18.S997 Introduction to MATLAB Programming](http://ocw.mit.edu/courses/mathematics/18-s997-introduction-to-matlab-programming-fall-2011/)