Add write a hash table in C tutorial

Author: jamesroutley

README.md

@@ -38,6 +38,7 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
     * [Part 4: TCP Data Flow & Socket API](http://www.saminiir.com/lets-code-tcp-ip-stack-4-tcp-data-flow-socket-api/)
     * [Part 5: TCP Retransmission](http://www.saminiir.com/lets-code-tcp-ip-stack-5-tcp-retransmission/)
 * [Build a Live Code-reloader Library for C++](http://howistart.org/posts/cpp/1/index.html)
+* [Write a hash table in C](https://github.com/jamesroutley/write-a-hash-table)
 
 ## C#:
 * [Learn C# By Building a Simple RPG Game](http://scottlilly.com/learn-c-by-building-a-simple-rpg-index/)
@@ -181,4 +182,4 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
 * [Egghead.io](http://www.egghead.io/)
 * [Michael Herman's Blog](http://mherman.org/)
 * [Thinkster.io](http://thinkster.io)
-* [Goodheads](http://goodheads.io)
+* [Goodheads](http://goodheads.io)