added example on README

README.md

@@ -2,12 +2,61 @@
 
 A port of Wordpress wp-includes/class-phpass.php class used to hash passwords.
 
-See original PHP class at [https://www.openwall.com/phpass/].
+See original PHP class PHPass at (https://www.openwall.com/phpass/)[https://www.openwall.com/phpass/].
 
 # Installation
 
 `npm install node-phpass`
 
+# Password hash
+
+```js
+const PasswordHash = require('node-phpass').PasswordHash;
+const CRYPT_BLOWFISH = require('node-phpass').CRYPT_BLOWFISH;
+const CRYPT_EXT_DES = require('node-phpass').CRYPT_EXT_DES;
+// or
+// const { PasswordHash, CRYPT_BLOWFISH, CRYPT_EXT_DES } = require('node-phpass')
+
+const len = 8;
+const portable = true;
+// major PHP version, 5 or 7, as it is a port of PHPass PHP class we rely
+// on php version on gensalt_private() method, it is an optional constructor 
+// argument wich defaults to 7
+const phpversion = 7; 
+
+const hasher = new PasswordHash(len, portable, phpversion);
+console.log('Hashing 123456 string');
+hasher.HashPassword('123456').then(hash => console.log('Private hash: ', hash));
+hasher.HashPassword('123456', CRYPT_BLOWFISH).then(hash => console.log('BCrypt hash: ', hash));
+hasher.HashPassword('123456', CRYPT_EXT_DES).then(hash => console.log('DES hash: ', hash));
+```
+
+# Verify a hash
+
+```js
+const PasswordHash = require('node-phpass').PasswordHash;
+// or
+// const { PasswordHash } = require('node-phpass')
+
+const len = 8;
+const portable = true;
+// major PHP version, 5 or 7, as it is a port of PHPass PHP class we rely
+// on php version on gensalt_private() method, it is an optional constructor 
+// argument wich defaults to 7
+const phpversion = 7; 
+
+const hasher = new PasswordHash(len, portable, phpversion);
+
+const storedhash = '$P$BVaXtDXwf/ceSVp8VpLKx8bS2Y4O5F/';
+const storedhash2 = '$P$BVaXtDXwf/ceSVp8VpLKx8bS2Y4O5E/';
+const password = '123456';
+const valid = hasher.CheckPassword(password, storedhash);
+const invalid = hasher.CheckPassword(password, storedhash2);
+
+console.log(valid ? 'OK' : 'INVALID');
+console.log(invalid ? 'OK' : 'INVALID');
+```
+
 # Contributing
 
 Any help on testing and improvements in this class is welcome. Fork the repo and send a PR.