Update readme file

Author: d8vjork

README.md

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-# laravel-json-api
+![json-api-logo](https://jsonapi.org/images/jsonapi.png)
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+<h1 align="center">Laravel JSON:API</h1>
+
 Integrate JSON:API resources on Laravel.
 
 **Note: This package is under active development and initial stage, please DON'T use it for production purposes.**