Initial project structure with Slim skeleton

app/repositories.php

@@ -0,0 +1,13 @@
+<?php
+declare(strict_types=1);
+
+use App\Domain\User\UserRepository;
+use App\Infrastructure\Persistence\User\InMemoryUserRepository;
+use DI\ContainerBuilder;
+
+return function (ContainerBuilder $containerBuilder) {
+    // Here we map our UserRepository interface to its in memory implementation
+    $containerBuilder->addDefinitions([
+        UserRepository::class => \DI\autowire(InMemoryUserRepository::class),
+    ]);
+};