Added Captcha library

tests/Socialbox/Other/CaptchaTest.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Socialbox\Other;
+
+use Gregwar\Captcha\CaptchaBuilder;
+use PHPUnit\Framework\TestCase;
+
+class CaptchaTest extends TestCase
+{
+    public function testCaptchaRendering()
+    {
+        $builder = new CaptchaBuilder("Foo Bar");
+        $builder->build();
+
+        $builder->save(__DIR__ . DIRECTORY_SEPARATOR . 'test.png');
+    }
+}