Add reference to interactive coding challenges repo (donnemartin#49)

Author: donnemartin

README.md

@@ -54,6 +54,19 @@ The provided [Anki flashcard decks](https://apps.ankiweb.net/) use spaced repeti
 
 Great for use while on-the-go.
 
+### Coding Resource: Interactive Coding Challenges
+
+Looking for resources to help you prep for the [**Coding Interview**](https://github.com/donnemartin/interactive-coding-challenges)?
+
+<p align="center">
+  <img src="http://i.imgur.com/b4YtAEN.png">
+  <br/>
+</p>
+
+Check out the sister repo [**Interactive Coding Challenges**](https://github.com/donnemartin/interactive-coding-challenges), which contains an additional Anki deck:
+
+* [Coding deck](anki_cards/https://github.com/donnemartin/interactive-coding-challenges/tree/master/anki_cards/Coding.apkg)
+
 ## Contributing
 
 > Learn from the community.