Add autoloader.php and services.php

plugins/autoload.php

@@ -0,0 +1,5 @@
+<?php
+
+return call_user_func(function () {
+    return require __DIR__ . '/../vendor/autoload.php';
+});

plugins/services.php

@@ -0,0 +1,7 @@
+<?php
+
+use Alchemy\Phrasea\Application;
+
+return call_user_func(function (Application $app) {
+    return $app;
+}, $app);