add base front

frontend/src/router.tsx

@@ -0,0 +1,19 @@
+import {
+  createBrowserRouter,
+} from "react-router";
+
+import Root from "./root";
+import { Home } from "./pages/Home";
+import { ContractForm } from "./pages/ContractForm";
+
+export const router = createBrowserRouter([
+  {
+    path: "/",
+    Component: Root,
+    // errorElement: <NotFound />,
+    children: [
+      { index: true, Component: Home },
+      { path: "/forms",  Component: ContractForm },
+    ],
+  },
+]);