update readme

implementation/16-caching/src/Kernel.php

@@ -0,0 +1,32 @@
+<?php declare(strict_types=1);
+
+namespace Lubian\NoFramework;
+
+use Lubian\NoFramework\Factory\RequestFactory;
+use Lubian\NoFramework\Http\Emitter;
+use Lubian\NoFramework\Http\Pipeline;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+final class Kernel implements RequestHandlerInterface
+{
+    public function __construct(
+        private readonly RequestFactory $requestFactory,
+        private readonly Pipeline $pipeline,
+        private readonly Emitter $emitter,
+    ) {
+    }
+
+    public function handle(ServerRequestInterface $request): ResponseInterface
+    {
+        return $this->pipeline->dispatch($request);
+    }
+
+    public function run(): void
+    {
+        $request = $this->requestFactory->fromGlobals();
+        $response = $this->handle($request);
+        $this->emitter->emit($response);
+    }
+}