Add support for Hidden fields

composer.json

@@ -1,6 +1,6 @@
 {
-    "name": "limenius/liform",
-    "description": "Library to transform Symfony Forms into Json Schema",
+    "name": "mention-me/liform",
+    "description": "Library to transform Symfony Forms into Json Schema.  Extends Limenius/liform.",
     "type": "library",
     "license": "MIT",
     "authors": [

src/Limenius/Liform/Transformer/HiddenTransformer.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Limenius\Liform\Transformer;
+
+use Symfony\Component\Form\FormInterface;
+
+class HiddenTransformer extends AbstractTransformer
+{
+	/**
+	 * Given that this transformation will only be called when the type is a hidden, it allows us to define how to build
+	 * the schema.
+	 *
+	 * {@inheritdoc}
+	 */
+	public function transform(FormInterface $form, array $extensions = [], $widget = null)
+	{
+		$schema = ['type' => 'string'];
+		$schema = $this->addCommonSpecs($form, $schema, $extensions, $widget);
+
+		return $schema;
+	}
+}