update readme file

Author: Turall

README.md

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 # OpaClient - Open Policy Agent Python Client
+[![MIT licensed](https://img.shields.io/github/license/Turall/OPA-python-client)](https://raw.githubusercontent.com/Turall/OPA-python-client/master/LICENSE)
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 OpaClient is a Python client library designed to interact with the [Open Policy Agent (OPA)](https://www.openpolicyagent.org/). It supports both **synchronous** and **asynchronous** requests, making it easy to manage policies, data, and evaluate rules in OPA servers.