Added Compiler Design Course (#7451)

* Added Compiler Design Course 

I added the course under compilers section which is of high quality and absolutely free available on youtube

* added playlist of compiler design

under compilers section

* fix Alphabetical ordering

* fix: don't invent titles! Use the title given by the resource.

* lint: alphabetize

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-en.md

@@ -276,6 +276,7 @@
 
 ### Compilers
 
+* [Compiler Design](https://youtube.com/playlist?list=PLBlnK6fEyqRjT3oJxFXRgjPNzeS-LFY-q) - Neso Academy
 * [Compilers](https://www.youtube.com/playlist?list=PL6KMWPQP_DM97Hh0PYNgJord-sANFTI3i) - Ghassan Shobaki (YouTube)
 * [Stanford's Compilers](https://www.edx.org/course/compilers)