Added a third resource.

Author: chaseofthejungle

README.md

@@ -27,5 +27,6 @@
 
 ## <a name="supplemental">2. Supplemental Resources</a>
 
+* *[Codiva](https://www.codiva.io/)* 
 * *[Intro to Java Overview Guide](https://github.com/chaseofthejungle/intro-to-java)*
 * *[Java Quick Reference Guide](https://github.com/chaseofthejungle/java-quick-reference-guide)*