Update README.md

Author: amculin

README.md

@@ -1,11 +1,15 @@
 <h1 align="center"><b>Implementation of Vigenere Cipher in PHP</b></h1>
 <p align="center">
-  <img src="https://img.shields.io/packagist/dt/amculin/vigenere-cipher" alt="Packagist Download" />
   <img src="https://img.shields.io/github/stars/amculin/php-vigenere-cipher" alt="GitHub Repo stars" />
+  <img src="https://img.shields.io/packagist/dt/amculin/vigenere-cipher" alt="Packagist Download" />
   <img src="https://img.shields.io/packagist/v/amculin/vigenere-cipher" alt="Packagist Version" />
   <img src="https://img.shields.io/github/actions/workflow/status/amculin/php-vigenere-cipher/build.yml" alt="Passed Build Workflow" />
   <img src="https://img.shields.io/badge/PHPStan-L_10-blue" alt="Passed PHPStan Level 10" />
 </p>
+<p align="center">
+  <img src="https://img.shields.io/badge/PHP_CS_Fixer-Optimized-green" alt="Optimized with PHP CS Fixer" />
+  <img src="https://img.shields.io/badge/Psalm-Checked-green" alt="Checked using Psalm" />
+</p>
 
 Encrypt/decrypt string using Vigenere Cipher algorithm
 ## Instalation
@@ -22,6 +26,7 @@ $key = 'thisisthekey';
 
 //Basic mode only support lowercase alphabet
 //You can use alpha_numeric mode for wider supported characters (a-z, A-Z, 0-9)
+//You can also use base64 mode to use Radix-64 character list (A-Z, a-z, 0-9, +/=)
 $encrypted = VigenereCipher::encrypt($data, $key, 'basic');
 
 echo "Plain text: {$data}\n";
@@ -59,7 +64,9 @@ Plain text: testtheencryptionprocess
 - [x] Support alpha-numeric mode (a-z, A-Z, 0-9)
 - [x] Unit test
 - [x] Comply PHPStan Level 10
+- [x] Checked using Psalm
+- [x] Optimized using PHP CS Fixer
+- [x] Add Base64 mode to support Base64 string
 
 ## Todos
 - [ ] Add ASCII mode to support file encryption/decryption
-- [ ] Add Base64 mode to support Base64 string