Add "Write a game boy emulator in Ocaml" (#419)

Author: axelbdt

README.md

@@ -588,6 +588,7 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
 ## OCaml:
 
 - [Implement a Language with LLVM in OCaml](https://llvm.org/docs/tutorial/#kaleidoscope-implementing-a-language-with-llvm-in-objective-caml)
+- [Writing a Game Boy Emulator in OCaml](https://linoscope.github.io/writing-a-game-boy-emulator-in-ocaml/)
 
 ## Ruby: