Added book on Cryptography (#2283)

* Added book on Cryptography

* Added book on Cryptograph, removed trailing slash.

free-programming-books.md

@@ -619,6 +619,7 @@
 
 #### Security
 
+* [A Graduate Course in Applied Cryptography](http://toc.cryptobook.us)
 * [Crypto 101 - Crypto for everyone](https://www.crypto101.io)
 * [CryptoParty Handbook](https://unglue.it/work/141611/)
 * [Handbook of Applied Cryptography](http://cacr.uwaterloo.ca/hac/index.html)