Added README

README.md

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+Gregwar's CaptchaBundle
+=====================
+
+`GregwarCaptchaBundle` provides the form type "captcha"
+
+Installation
+============
+
+To install `GregwarCaptchaBundle`, first adds it to your `deps`:
+
+    [GregwarCaptchaBundle]
+        git=git://github.com/Gregwar/CaptchaBundle.git
+        target=/bundles/Gregwar/CaptchaBundle
+
+And run `php bin/vendors install`. Then add the namespace to your `app/autoload.php` 
+file:
+
+```php
+<?php
+...
+'Gregwar' => __DIR__.'/../vendor/bundles',
+...
+```
+
+And registers the bundle in your `app/AppKernel.php`:
+
+```php
+<?php
+//...
+public function registerBundles()
+{
+    $bundles = array(
+        ...
+        new Gregwar\CaptchaBundle\GregwarCaptchaBundle(),
+        ...
+    );
+...
+```
+
+Adds the following configuration to your `app/config/config.yml`:
+
+    gregwar_captcha: ~
+
+Usage
+=====
+
+You can use the "captcha" type in your forms this way:
+
+```php
+<?php
+    // ...
+    $builder->add('captcha', 'captcha'); // That's all !
+    // ...
+```
+
+Note that the generated image will be embeded in the HTML document, to avoid dealing
+with route and subrequests.
+
+License
+=======
+
+This bundle is under MIT license