add useCssModule example

[runyasak]

Description of Problem

The style module is an interesting feature in Vue.js, and the useCssModule helper is also quite useful. However, it seems like useCssModule lacks an example, which would make it easier for beginners to understand and use.

Proposed Solution

I have added a simple example for useCssModule to demonstrate how to implement it.

Additional Information

Screenshot result:

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If you have any feedback or suggestions, please do not hesitate to let me know. 😁