Add next-multilingual example (vercel#29386)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [x] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [x] Make sure the linting passes


Co-authored-by: Lee Robinson <9113740+leerob@users.noreply.github.com>

examples/with-next-multilingual/README.md

@@ -0,0 +1,5 @@
+# with-next-multilingual
+
+The `next-multilingual` module is a unique i18n module for Next.js that offers localized URLs and modular string management on top of other standard features required for multilingual applications.
+
+[View the example](https://github.com/Avansai/next-multilingual-example) or the [main repository](https://github.com/Avansai/next-multilingual).