Add next-multilingual example

examples/with-next-multilingual/README.md

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+# 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).