[Examples] -> Add external official example with-react-query (verce…

…l#38101)

Add external and official example with
[react-query](https://react-query.tanstack.com/).

Note: [into the
contributing.md#adding-examples](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)
don't have any specification to external examples. For example, to new
external examples, I need add some `.gitignore`? I really think that no,
maybe this information can be on the document above....

Another external example:
[with-material-ui](https://github.com/vercel/next.js/tree/canary/examples/with-material-ui)

Thanks,

Co-authored-by: Balázs Orbán <info@balazsorban.com>

examples/with-react-query/README.md

@@ -0,0 +1,5 @@
+# React Query
+
+**Note:** This example is maintained outside of the Next.js repository:
+
+- Official [TypeScript example](https://github.com/TanStack/query/tree/beta/examples/react/nextjs)