timeline and readme

ui/timeline/src/main.tsx

@@ -0,0 +1,9 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import App from './App'
+
+ReactDOM.createRoot(document.getElementById('app')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+)