Add some controllers and actions for user registration.

code/src/Controller/Controller.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Slovocast\Controller;
+
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+use Slim\Views\Twig;
+use Slim\Routing\RouteContext;
+
+abstract class Controller
+{
+    protected Request $request;
+    protected Response $response;
+    protected array $args;
+    protected RouteContext $routeContext;
+
+    /**
+     * Make the Class invokable and pass it into a route as its handler.
+     *
+     * @param Request $request
+     * @param Response $response
+     * @param array $args List of possible URL arguments
+     * @return Response
+     */
+    public function __invoke(
+        Request $request,
+        Response $response,
+        array $args = []
+    ): Response {
+        $this->request = $request;
+        $this->response = $response;
+        $this->args = $args;
+        $this->routeContext = RouteContext::fromRequest($this->request);
+
+        return $this->respond($request, $response);
+    }
+
+    /**
+     * Implement this method for handling the request.
+     *
+     * @return Response
+     */
+    abstract public function respond(): Response;
+
+    /**
+     * Render the given Template. 
+     *
+     * @param string $templateName The name of the template
+     * @param array $data The data for the template
+     * @return Response
+     */
+    public function render(string $templateName, array $data = []): Response
+    {
+        $view = Twig::fromRequest($this->request);
+        return $view->render($this->response, $templateName, $data);
+    }
+}

code/src/Controller/User/RegisterUserAction.php

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+<?php
+
+namespace Slovocast\Controller\User;
+
+use Psr\Http\Message\ResponseInterface as Response;
+use Slovocast\Controller\Controller;
+
+class RegisterUserAction extends Controller
+{
+    public function respond(): Response
+    {
+        return $this->respond('user/register/success'); 
+    }
+}

code/src/Controller/User/RegisterUserPage.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Slovocast\Controller\User;
+
+use Psr\Http\Message\ResponseInterface as Response;
+use Slovocast\Controller\Controller;
+
+class RegisterUserPage extends Controller
+{
+    public function respond(): Response
+    {
+        return $this->render('user/register');
+    }
+}

code/src/Routes.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Slovocast;
+
+use Slim\App;
+use Slovocast\Controller\User\{
+    RegisterUserPage,
+    RegisterUserAction
+};
+
+class Routes
+{
+    public static function init(App $app): void
+    {
+        // User Routes
+        self::users($app);
+    }
+
+    protected static function users(App $app): void
+    {
+        $app->get('/users/register', RegisterUserPage::class);
+        $app->post('/users/register', RegisterUserAction::class);
+    }
+}