Update README.md

Author: anuj9196

README.md

@@ -5,3 +5,65 @@ php class for random and secure password generation
 ```
 composer require tbetool/php-password-generator
 ```
+# Usage
+### Create object
+```
+use TBETool\PasswordGenerator;
+
+$passwordGenerator = new PasswordGenerator();
+```
+You can optionally pass following parameters to constructor
+```
+use TBETool\PasswordGenerator;
+
+$passwordGenerator = new PasswordGenerator($length, $count, $characters);
+```
+#### Parameter Details
+```
+$length (int) : Length of the password to generate, Default: 8
+$count (int) : No of passwords to generate, Default: 1
+$characters (string): Characters to use while password generation
+```
+#### Supported Characters
+1. lower_case
+1. upper_case
+1. numbers
+1. special_symbols
+
+#### Example with parameter
+```
+use TBETool\PasswordGenerator;
+
+$passwordGenerator = new PasswordGenerator(16, 5, 'lower_case,numbers,special_symbols');
+```
+
+### Generate Password
+This will return single password from all passwords generated
+```
+@return string of password
+$password = $passwordGenerator->generate();
+```
+
+### Get All Generated Passwords
+```
+@return array of passwords
+$passwords = $passwordGenerator->getPasswords();
+```
+
+### Get new password from generated passwords
+```
+@return string of new password
+$password = $passwordGenerator->getPassword();
+```
+
+### Get last accessed password
+```
+@return string of last password retrieved
+$password = $passwordGenerator->getLastPassword();
+```
+
+# Developer
+Anuj Sharma (https://anujsh.gitlab.io) 
+
+# Package
+TBE (http://thebornengineer.com)