add index page (#73)

add index page

apps/deno-vless/src/index.tsx

@@ -0,0 +1,13 @@
+import { StrictMode } from 'react';
+import * as ReactDOM from 'react-dom/client';
+import App from './app/app';
+import './styles.css';
+
+const root = ReactDOM.createRoot(
+  document.getElementById('root') as HTMLElement
+);
+root.render(
+  <StrictMode>
+    <App />
+  </StrictMode>
+);