Please add example for astro multi-framework #443

Clear and concise description of the problem

As we know astro support multiple UI framework:
https://github.com/withastro/astro/tree/main/examples/framework-multiple

Please add example how to use unplugin in astro multi framework project

Suggested solution

add example how to use unplugin in astro multi framework project

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.