Update README.md

Author: wolfy-j

README.md

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-The JSON Schema Generator is a PHP package that simplifies the generation of JSON schemas from Data Transfer Object (DTO) classes. 
+The JSON Schema Generator is a PHP package that simplifies the generation of [JSON schemas](https://json-schema.org/) from Data Transfer Object (DTO) classes. 
 It supports PHP enumerations and generic type annotations for arrays and provides an attribute for specifying title, description, and default value.
 
 Main use case - structured output definition for LLMs.