add site to view and upload files

Reviewed-on: sites/file-explorer#4

src/Forms/UploadFileForm.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Forms;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\FileType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+
+class UploadFileForm extends AbstractType
+{
+    public function __construct(private readonly UrlGeneratorInterface $urlGenerator)
+    {
+    }
+
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $builder
+            ->setAction($this->urlGenerator->generate('app_upload'))
+            ->add('file', FileType::class, [
+            'attr' => ['class' => 'hidden'],
+            'multiple' => true,
+        ]);
+    }
+}