Update README.md

Author: Amadeco

README.md

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 This module by Amadeco extends the Smile Custom Entity (https://github.com/Smile-SA/magento2-module-custom-entity) module to add SEO capabilities.
 
+![Screenshot of the new fields in custom entity form]([http://url/to/img.png](https://github.com/user-attachments/assets/dedf41e7-394e-4010-9354-23f7d7c5531a))
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 ## Features
 
 - Adds SEO attributes to Custom Entities: