Add custom email for 2FA

Related #1490

src/Wallabag/UserBundle/DependencyInjection/Configuration.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Wallabag\UserBundle\DependencyInjection;
+
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+
+class Configuration implements ConfigurationInterface
+{
+    public function getConfigTreeBuilder()
+    {
+        $treeBuilder = new TreeBuilder();
+        $rootNode = $treeBuilder->root('wallabag_user');
+
+        return $treeBuilder;
+    }
+}