feat(tanstack): initialize TanStack project with routing, API, and error handling components

tanstack/src/routes/_pathlessLayout/_nested-layout.tsx

@@ -0,0 +1,34 @@
+import { Link, Outlet, createFileRoute } from '@tanstack/react-router'
+
+export const Route = createFileRoute('/_pathlessLayout/_nested-layout')({
+  component: LayoutComponent,
+})
+
+function LayoutComponent() {
+  return (
+    <div>
+      <div>I'm a nested layout</div>
+      <div className="flex gap-2 border-b">
+        <Link
+          to="/route-a"
+          activeProps={{
+            className: 'font-bold',
+          }}
+        >
+          Go to route A
+        </Link>
+        <Link
+          to="/route-b"
+          activeProps={{
+            className: 'font-bold',
+          }}
+        >
+          Go to route B
+        </Link>
+      </div>
+      <div>
+        <Outlet />
+      </div>
+    </div>
+  )
+}

tanstack/src/routes/_pathlessLayout/_nested-layout/route-a.tsx

@@ -0,0 +1,11 @@
+import { createFileRoute } from '@tanstack/react-router'
+
+export const Route = createFileRoute('/_pathlessLayout/_nested-layout/route-a')(
+  {
+    component: LayoutAComponent,
+  },
+)
+
+function LayoutAComponent() {
+  return <div>I'm A!</div>
+}

tanstack/src/routes/_pathlessLayout/_nested-layout/route-b.tsx

@@ -0,0 +1,11 @@
+import { createFileRoute } from '@tanstack/react-router'
+
+export const Route = createFileRoute('/_pathlessLayout/_nested-layout/route-b')(
+  {
+    component: LayoutBComponent,
+  },
+)
+
+function LayoutBComponent() {
+  return <div>I'm B!</div>
+}