add README

Author: xgfd3

README.md

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+# Sample projects for the Agora RTC Native SDK
+
+_English | [中文](README.zh.md)_
+
+## Overview
+
+This repository contains sample projects for the Agora RTC Native SDK, including the following platforms:
+
+| Platform | Language | Project Location                                       | SDK                                                          |
+| -------- | -------- | ------------------------------------------------------ | ------------------------------------------------------------ |
+| Android  | Java     | [/Android/APIExample](/Android/APIExample)             | [RTC Java Video SDK](https://docs.agora.io/en/video-call-4.x-beta/API%20Reference/java_ng/API/rtc_api_overview_ng.html) |
+| Android  | Java     | [/Android/APIExample-Audio](/Android/APIExample-Audio) | [RTC Java Audio SDK](https://docs.agora.io/en/voice-call-4.x-beta/API%20Reference/java_ng/API/rtc_api_overview_ng.html) |
+| iOS      | Swift    | [/iOS/APIExample](/iOS/APIExampe)                      | [RTC Objective-C Video SDK](https://docs.agora.io/en/video-call-4.x-beta/API%20Reference/ios_ng/API/rtc_api_overview_ng.html) |
+| iOS      | Swift    | [/iOS/APIExample-Audio](/iOS/APIExampe-Audio)          | [RTC Objective-C Audio SDK](https://docs.agora.io/en/voice-call-4.x-beta/API%20Reference/ios_ng/API/rtc_api_overview_ng.html) |
+| macOS    | Swift    | [/macOS](/macOS)                                       | [RTC Objective-C Video SDK](https://docs.agora.io/en/video-call-4.x-beta/API%20Reference/mac_ng/API/rtc_api_overview_ng.html) |
+| Windows  | C++      | [/windows](/windows)                                   | [RTC C++ Video SDK](https://docs.agora.io/en/video-call-4.x-beta/API%20Reference/windows_ng/API/rtc_api_overview_ng.html) |
+
+You can refer to each individual platform to learn more about the projects.
+
+## Feedback
+
+If you have any problems or suggestions regarding the sample projects, feel free to file an issue.
+
+## Related resources
+
+- Check our [FAQ](https://docs.agora.io/en/faq) to see if your issue has been recorded.
+- Dive into [Agora SDK Samples](https://github.com/AgoraIO) to see more tutorials.
+- Take a look at [Agora Use Case](https://github.com/AgoraIO-usecase) for more complicated real use case.
+- Repositories managed by developer communities can be found at [Agora Community](https://github.com/AgoraIO-Community).
+- If you encounter problems during integration, feel free to ask questions in [Stack Overflow](https://stackoverflow.com/questions/tagged/agora.io).
+
+## License
+
+The sample projects are under the MIT license.

README.zh.md

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+# Agora RTC Native SDK 示例项目
+
+[English](README.md) | 中文
+
+## 简介
+
+此仓库包含 Agora RTC Native SDK 的示例项目。
+
+| 平台 | 语言 | 项目位置     | SDK                                                                                                                             |
+| -------- | -------- | -------------------- | ------------------------------------------------------------------------------------------------------------------------------- |
+| Android  | Java     | [/Android/APIExample](/Android/APIExample) | [RTC Java Video SDK](https://docs.agora.io/cn/video-call-4.x/API%20Reference/java_ng/API/rtc_api_overview_ng.html) |
+| Android | Java | [/Android/APIExample-Audio](/Android/APIExample-Audio) | [RTC Java Audio SDK](https://docs.agora.io/cn/voice-call-4.x/API%20Reference/java_ng/API/rtc_api_overview_ng.html) |
+| iOS      | Swift    | [/iOS/APIExample](/iOS/APIExample) | [RTC Objective-C Video SDK](https://docs.agora.io/cn/video-call-4.x/API%20Reference/ios_ng/API/rtc_api_overview_ng.html) |
+| iOS | Swift | [/iOS/APIExample-Audio](/iOS/APIExample-Audio) | [RTC Objective-C Audio SDK](https://docs.agora.io/cn/voice-call-4.x/API%20Reference/ios_ng/API/rtc_api_overview_ng.html) |
+| macOS    | Swift    | [/macOS](/macOS)     | [RTC Objective-C Video SDK](https://docs.agora.io/cn/video-call-4.x/API%20Reference/mac_ng/API/rtc_api_overview_ng.html) |
+| Windows  | C++      | [/windows](/windows) | [RTC C++ Video SDK](https://docs.agora.io/cn/video-call-4.x/API%20Reference/windows_ng/API/rtc_api_overview_ng.html) |
+
+你可以进入不同平台的项目进行试用或参考源代码。
+
+## 反馈
+
+如果你有任何问题或建议，可以通过 issue 的形式反馈。
+
+## 相关资源
+
+- 你可以先参阅 [常见问题](https://docs.agora.io/cn/faq)
+- 如果你想了解更多官方示例，可以参考 [官方 SDK 示例](https://github.com/AgoraIO)
+- 如果你想了解声网 SDK 在复杂场景下的应用，可以参考 [官方场景案例](https://github.com/AgoraIO-usecase)
+- 如果你想了解声网的一些社区开发者维护的项目，可以查看 [社区](https://github.com/AgoraIO-Community)
+- 若遇到问题需要开发者帮助，你可以到 [开发者社区](https://rtcdeveloper.com/) 提问
+- 如果需要售后技术支持, 你可以在 [Agora Dashboard](https://dashboard.agora.io) 提交工单
+
+## 许可证
+
+示例项目遵守 MIT 许可证。