Update README.md

Coding Interview Patterns is included as a recommended book to supplement learning.

README.md

@@ -387,15 +387,20 @@ Your choice:
 
 ## Interview Prep Books
 
-You don't need to buy a bunch of these. Honestly "Cracking the Coding Interview" is probably enough,
-but I bought more to give myself more practice. But I always do too much.
+Here are some recommended books to supplement your learning.
 
-I bought both of these. They gave me plenty of practice.
+
+- [Coding Interview Patterns: Nail Your Next Coding Interview](https://geni.us/q7svoz) (**Main recommendation**)
+    - An insider’s perspective on what interviewers are truly looking for and why.
+    - 101 real coding interview problems with detailed solutions.
+    - Intuitive explanations that guide you through each problem as if you were solving it in a live interview.
+    - 1000+ diagrams to illustrate key concepts and patterns.	
 
 - [Programming Interviews Exposed: Coding Your Way Through the Interview, 4th Edition](https://www.amazon.com/Programming-Interviews-Exposed-Through-Interview/dp/111941847X/)
     - Answers in C++ and Java
     - This is a good warm-up for Cracking the Coding Interview
     - Not too difficult. Most problems may be easier than what you'll see in an interview (from what I've read)
+
 - [Cracking the Coding Interview, 6th Edition](http://www.amazon.com/Cracking-Coding-Interview-6th-Programming/dp/0984782850/)
     - answers in Java