init commit,

03_source/frontend/src/main.tsx

@@ -0,0 +1,29 @@
+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+import { Outlet, RouterProvider, createBrowserRouter } from 'react-router';
+
+import App from './app';
+import { routesSection } from './routes/sections';
+import { ErrorBoundary } from './routes/components';
+
+// ----------------------------------------------------------------------
+
+const router = createBrowserRouter([
+  {
+    Component: () => (
+      <App>
+        <Outlet />
+      </App>
+    ),
+    errorElement: <ErrorBoundary />,
+    children: routesSection,
+  },
+]);
+
+const root = createRoot(document.getElementById('root')!);
+
+root.render(
+  <StrictMode>
+    <RouterProvider router={router} />
+  </StrictMode>
+);