add simple-host example

examples/simple-host/example-host.html

@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <style>
+            #chat-root {
+                display: flex;
+                flex-direction: column;
+            }
+        </style>
+        <script src="/src/example-host.ts" type="module"></script>
+        <title>Example MCP View Host</title>
+    </head>
+    <body>
+        <h1>Example MCP View Host</h1>
+
+        <div id="controls"></div>
+        <div id="chat-root"></div>
+    </body>
+</html>