create d1 tutorial

d1-tutorial/public/index.html

@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<meta charset="UTF-8" />
+		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+		<title>Hello, World!</title>
+	</head>
+	<body>
+		<h1 id="heading"></h1>
+		<p>This page comes from a static asset stored at `public/index.html` as configured in `wrangler.jsonc`.</p>
+		<script>
+			fetch('/message')
+				.then((resp) => resp.text())
+				.then((text) => {
+					const h1 = document.getElementById('heading');
+					h1.textContent = text;
+				});
+		</script>
+	</body>
+</html>