Add rss for entries

will fix #1000

src/Wallabag/CoreBundle/Form/Type/RssType.php

@@ -0,0 +1,29 @@
+<?php
+namespace Wallabag\CoreBundle\Form\Type;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\OptionsResolver\OptionsResolverInterface;
+
+class RssType extends AbstractType
+{
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $builder
+            ->add('rss_limit', 'text')
+            ->add('save', 'submit')
+        ;
+    }
+
+    public function setDefaultOptions(OptionsResolverInterface $resolver)
+    {
+        $resolver->setDefaults(array(
+            'data_class' => 'Wallabag\CoreBundle\Entity\Config',
+        ));
+    }
+
+    public function getName()
+    {
+        return 'rss_config';
+    }
+}