Fix formatting issues in README.md example

Author: kristos80

README.md

@@ -29,13 +29,18 @@ composer require kristos80/password-generator
 ### Basic Example
 
 ```php
+<?php
+declare(strict_types=1);
+
+require_once __DIR__ . "/vendor/autoload.php";
+
 use Kristos80\PasswordGenerator\PasswordGenerator;
 use Kristos80\PasswordGenerator\PasswordGeneratorConfigFactory;
 
 $config = PasswordGeneratorConfigFactory::safeDefault();
 $password = (new PasswordGenerator())->generate($config);
 
-echo $password;
+echo $password; //Cf<q{h8q4M%
 ```
 
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