Added F# 4.0 Design Patterns book info

learn.md

@@ -316,6 +316,25 @@ Learn F# is a practical guide for experienced C# and .NET developers that teache
 
 By the end of the book, you’ll be able to use F# in your day-to-day development, and know how and where to deepen your knowledge.
 
+### [F# 4.0 Design Patterns](https://www.packtpub.com/application-development/f-40-design-patterns)
+
+<img src="/about/files/BookFS4DP.jpg" style="float:right;margin:5px 0px 5px 25px;" />
+
+_Gene Belitski_
+
+This book will encourage enterprise developers coming to F# from other platforms to cultivate an idiomatic F# coding skillset by fully embracing the functional-first F# paradigm.
+
+In this book you will:
+
+- Acquire the practical knowledge to use the main functional design patterns
+- Realign some imperative and object-oriented principles under the functional approach
+- Develop your confidence in building and combining first-order and higher-order functions
+- Learn to use core language pattern matching effectively
+- Make use of native F# algebraic data types in place of custom-built classes
+- Recognize and measure the difference in resource consumption between sequences and materialized data collections
+- Navigate and use F# Core libraries with ease by seeing patterns behind specific library functions
+- Master writing generic polymorphic code
+
 ## F# Books (Coming Soon)
 
 ### [Understanding Functional Programming](https://leanpub.com/understandingfunctionalprogramming)