Add Compiler Design The ANTLR Mega Tutorial (#3345)

free-programming-books.md

@@ -382,6 +382,7 @@
 * [Implementing Functional Languages: A Tutorial](http://research.microsoft.com/en-us/um/people/simonpj/Papers/pj-lester-book/) - Simon Peyton Jones, David Lester
 * [Let's Build a Compiler](http://www.stack.nl/~marcov/compiler.pdf) (PDF)
 * [Practical and Theoretical Aspects of Compiler Construction](http://web.stanford.edu/class/archive/cs/cs143/cs143.1128/) (class lectures and slides)
+* [The ANTLR Mega Tutorial](https://tomassetti.me/antlr-mega-tutorial/)
 
 
 #### Computer Science