add initial README for Yelix OpenAPI Registry

Author: GroophyLifefor

readme.md

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+> This JSR registry is taken because of Yelix's future plans to support it, for now Yelix uses OpenAPI layer inside Yelix without an internal or external library.
+
+# Yelix OpenAPI Registry
+
+This is a registry for Yelix OpenAPI, which is a wrapper around the OpenAPI specification. It allows you to define your API in a simple and easy-to-read format, and then generate client libraries, server stubs, and API documentation from it.
+
+https://spec.openapis.org/oas/v3.1.1.html
+
+## Authors
+
+[@GroophyLifefor (Murat)](https://github.com/GroophyLifefor) and [@mertssmnoglu (Mert)](https://github.com/mertssmnoglu)