Add cryptography classic written by Bruce Schneier (#171)

README.md

@@ -99,6 +99,7 @@ A curated list of cryptography resources and links.
 
 - [A Graduate Course in Applied Cryptography](https://crypto.stanford.edu/~dabo/cryptobook/) - The book covers many constructions for different tasks in cryptography.
 - [An Introduction to Mathematical Cryptography](http://www.math.brown.edu/~jhs/MathCryptoHome.html) - Introduction to modern cryptography.
+- [Applied Cryptography: Protocols, Algorithms and Source Code in C](https://www.wiley.com/en-ie/Applied+Cryptography%3A+Protocols%2C+Algorithms+and+Source+Code+in+C%2C+20th+Anniversary+Edition-p-9781119439028) - This cryptography classic provides you with a comprehensive survey of modern cryptography. 
 - [Crypto101](https://www.crypto101.io/) - Crypto 101 is an introductory course on cryptography.
 - [Cryptography Engineering](https://www.schneier.com/books/cryptography_engineering/) - Learn to build cryptographic protocols that work in the real world.
 - [Handbook of Applied Cryptography](https://cacr.uwaterloo.ca/hac/) - This book is intended as a reference for professional cryptographers.