Added a simple search engine

Fix #18

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

@@ -0,0 +1,29 @@
+<?php
+
+namespace Wallabag\CoreBundle\Form\Type;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class SearchEntryType extends AbstractType
+{
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $builder
+            ->setMethod('GET')
+            ->add('term', TextType::class, [
+                'required' => true,
+                'label' => 'entry.new.form_search.term_label',
+            ])
+        ;
+    }
+
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $resolver->setDefaults([
+            'csrf_protection' => false,
+        ]);
+    }
+}