feat: add header for README

README.md

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-# Nexa SDK
+<div align="center">
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+<h1>Nexa SDK</h1>
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+[![MacOS][MacOS-image]][release-url] [![Linux][Linux-image]][release-url] [![Windows][Windows-image]][release-url]
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+[![GitHub Release](https://img.shields.io/github/v/release/NexaAI/nexa-sdk)](https://github.com/NexaAI/nexa-sdk/releases/latest) [![Build workflow](https://img.shields.io/github/actions/workflow/status/NexaAI/nexa-sdk/ci.yaml?label=CI)](https://github.com/NexaAI/nexa-sdk/actions/workflows/ci.yaml?query=branch%3Amain) ![GitHub License](https://img.shields.io/github/license/NexaAI/nexa-sdk)
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+<!-- ![PyPI - Python Version](https://img.shields.io/pypi/pyversions/nexaai) ![PyPI - Downloads](https://img.shields.io/pypi/dm/nexaai?color=orange) -->
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+![Discord](https://img.shields.io/discord/1192186167391682711?logo=discord&color=b19cd9&labelColor=lightgrey)
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+
+[On-device Model Hub](https://model-hub.nexa4ai.com/) / [Nexa SDK Documentation](https://docs.nexaai.com/)
+
+
+[release-url]: https://github.com/NexaAI/nexa-sdk/releases
+[Windows-image]: https://img.shields.io/badge/windows-0078D4?logo=windows
+[MacOS-image]: https://img.shields.io/badge/-MacOS-black?logo=apple
+[Linux-image]: https://img.shields.io/badge/-Linux-333?logo=ubuntu
+
+</div>
 
 The Nexa SDK is a comprehensive toolkit for supporting **ONNX** and **GGML** models. It supports text generation, image generation, vision-language models (VLM), and text-to-speech (TTS) capabilities. Additionally, it offers an OpenAI-compatible API server with JSON schema mode for function calling and streaming support, and a user-friendly Streamlit UI.