Add tutorial codecrafters-io#103

Author: danistefanovic

README.md

@@ -222,6 +222,7 @@
 * [**Python**: _lisp.py: Make your own Lisp interpreter_](http://khamidou.com/compilers/lisp.py/)
 * [**Python**: _Simple Iterator-based Parsing_](http://effbot.org/zone/simple-iterator-parser.htm)
 * [**Python**: _Simple Top-Down Parsing in Python_](http://effbot.org/zone/simple-top-down-parsing.htm)
+* [**Python**: _How to Write a Lisp Interpreter in Python_](http://norvig.com/lispy.html)
 * [**Racket**: _Beautiful Racket: How to make your own programming languages with Racket_](https://beautifulracket.com/)
 * [**Ruby**: _A Compiler From Scratch_](https://www.destroyallsoftware.com/screencasts/catalog/a-compiler-from-scratch)
 * [**Ruby**: _Markdown compiler from scratch in Ruby_](https://blog.beezwax.net/2017/07/07/writing-a-markdown-compiler/)