Add tutorial #20

README.md

@@ -123,6 +123,7 @@
   * [**C**: *Baby's First Garbage Collector*](http://journal.stuffwithstuff.com/2013/12/08/babys-first-garbage-collector/)
   * [**C**: *Build Your Own Lisp: Learn C and build your own programming language in 1000 lines of code*](http://www.buildyourownlisp.com/)
   * [**C**: *Implement a minimal interpreter, Compiler (x86/Arm) and JIT compiler from scratch*](https://www.slideshare.net/jserv/jit-compiler)
+  * [**C**: *Writing a Simple Garbage Collector in C*](http://maplant.com/gc.html)
   * [**C++**: *Writing Your Own Toy Compiler Using Flex*](https://gnuu.org/2009/09/18/writing-your-own-toy-compiler/)
   * [**Go**: *Lexical Scanning in Go*](https://www.youtube.com/watch?v=HxaD_trXwRE) [video]
   * [**Haskell**: *Let's Build a Compiler*](http://alephnullplex.github.io/cradle/)