Add Password4j to Java (#144)

README.md

@@ -303,6 +303,7 @@ algorithm.
 - [Keycloak](https://github.com/keycloak/keycloak) - Open Source Identity and Access Management For Modern Applications and Services.
 - [keywhiz](https://github.com/square/keywhiz) - A system for distributing and managing secrets.
 - [pac4j](https://github.com/pac4j/pac4j) - Security engine.
+- [Password4j](https://github.com/Password4j/password4j) - A Java user-friendly cryptographic library for hashing and checking passwords with different Key derivation functions (KDFs) and Cryptographic hash functions (CHFs).
 - [Project Kalium](http://abstractj.github.io/kalium/) - Java binding to the Networking and Cryptography (NaCl) library with the awesomeness of libsodium.
 - [scrypt](https://github.com/wg/scrypt) - Pure Java implementation of the scrypt key derivation function and a JNI interface to the C implementations, including the SSE2 optimized version.
 - [securitybuilder](https://github.com/tersesystems/securitybuilder) - Fluent Builder API for JCA/JSSE objects.