add chapter 12 solutions

implementation/12/src/Action/Hello.php

@@ -0,0 +1,31 @@
+<?php declare(strict_types=1);
+
+namespace Lubian\NoFramework\Action;
+
+use Lubian\NoFramework\Service\Time\Clock;
+use Lubian\NoFramework\Template\Renderer;
+use Psr\Http\Message\ResponseInterface;
+
+final class Hello
+{
+    public function __invoke(
+        ResponseInterface $response,
+        Clock $clock,
+        Renderer $renderer,
+        string $name = 'Stranger',
+    ): ResponseInterface {
+        $data = [
+            'name' => $name,
+            'time' => $clock->now()
+                ->format('H:i:s'),
+        ];
+
+        $content = $renderer->render('hello', $data,);
+
+        $body = $response->getBody();
+        $body->write($content);
+
+        return $response->withBody($body)
+            ->withStatus(200);
+    }
+}