docs: update README.md

Author: mkafonso

README.md

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+## Example
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+![Untitled](https://github.com/user-attachments/assets/ae518aa4-c4ba-420c-af1c-236271114b33)
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 # Schema - A Go Validation Library
 
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 This is an open-source schema validation toolkit inspired by zod.dev. It provides a simple and expressive API for validating strings, numbers, struct, ... with various constraints. Schema is designed to be easy to use, extensible, and suitable for a wide range of applications.
 
 Feel free to use and modify it for any purpose. If you have any suggestions for improvement, please don't hesitate to reach out. Thank you!