Add boilerplate code, Docker environment, Makefile etc.

src/Dependencies.php

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+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin;
+
+use DI\Container;
+use MailAccountAdmin\Login\LoginController;
+use Psr\Container\ContainerInterface;
+use Slim\Views\Twig;
+
+class Dependencies
+{
+    private const SETTINGS = 'settings';
+    private const TWIG = 'view';
+    private const TWIG_TEMPLATE_DIR = __DIR__ . '/../templates';
+
+    public static function createContainer(Settings $settings): Container
+    {
+        $container = new Container();
+
+        // App settings
+        $container->set(self::SETTINGS, $settings);
+
+        // Twig template engine
+        $container->set(self::TWIG, function (ContainerInterface $c) {
+            /** @var Settings $settings */
+            $settings = $c->get(self::SETTINGS);
+
+            return Twig::create(self::TWIG_TEMPLATE_DIR, $settings->getTwigSettings());
+        });
+
+        // Login, registration, authentication
+        $container->set(LoginController::class, function (ContainerInterface $c) {
+            return new LoginController(
+                $c->get(self::TWIG)
+            );
+        });
+
+        return $container;
+    }
+}

src/Login/LoginController.php

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+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin\Login;
+
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+use Slim\Views\Twig;
+
+class LoginController
+{
+    /** @var Twig */
+    private $view;
+
+    public function __construct(Twig $view)
+    {
+        $this->view = $view;
+    }
+
+    public function showLoginPage(Request $request, Response $response): Response
+    {
+        $renderData = [
+        ];
+
+        return $this->view->render($response, 'login.html', $renderData);
+    }
+}

src/Middlewares.php

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+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin;
+
+use Slim\App;
+use Slim\Views\TwigMiddleware;
+
+class Middlewares
+{
+    public static function setMiddlewares(App $app): void
+    {
+        $app->add(TwigMiddleware::createFromContainer($app));
+    }
+}

src/Routes.php

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+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin;
+
+use MailAccountAdmin\Login\LoginController;
+use Slim\App;
+
+class Routes
+{
+    public static function setRoutes(App $app): void
+    {
+        $app->get('/', LoginController::class . ':showLoginPage');
+    }
+}

src/Settings.php

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+<?php
+declare(strict_types=1);
+
+namespace MailAccountAdmin;
+
+class Settings
+{
+    public function getTwigSettings(): array
+    {
+        $cacheDir = getenv('TWIG_CACHE_DIR');
+
+        return [
+            'cache' => !empty($cacheDir) ? $cacheDir : false,
+        ];
+    }
+}