add new guide service

src/Service/MarkdownRenderer.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use League\CommonMark\MarkdownConverter;
+use League\CommonMark\Environment\Environment;
+use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
+use League\CommonMark\Extension\GithubFlavoredMarkdownExtension;
+
+final class MarkdownRenderer
+{
+    private MarkdownConverter $converter;
+
+    public function __construct()
+    {
+        $config = [
+            'html_input' => 'strip',
+            'allow_unsafe_links' => false,
+        ];
+
+        $environment = new Environment($config);
+
+        // Core Markdown
+        $environment->addExtension(new CommonMarkCoreExtension());
+
+        // GitHub Flavored Markdown (Tables, Strikethrough, Autolinks, Task Lists)
+        $environment->addExtension(new GithubFlavoredMarkdownExtension());
+
+        $this->converter = new MarkdownConverter($environment);
+    }
+
+    public function render(string $markdown): string
+    {
+        return (string) $this->converter->convert($markdown);
+    }
+}