feat: renderer

testdata/data/article_simple/input.md

@@ -0,0 +1,8 @@
+---
+@type: Article
+author.name: John Doe
+---
+
+# My First Article
+
+This is the content of my first article. It's a simple one.

testdata/data/article_simple/output.json

@@ -0,0 +1,10 @@
+{
+  "@context": "https://schema.org",
+  "@type": "Article",
+  "headline": "My First Article",
+  "author": {
+    "@type": "Person",
+    "name": "John Doe"
+  },
+  "articleBody": "This is the content of my first article. It's a simple one."
+}