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Create _README.md

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-> 仅支持3.8.0及以上版本的HBuilderX  
+## 版本支持
+- HBuilderX正式版 3.7.10+
+- HBuilderX alpha版 3.8.0+
 
 ### 文档已移至uni-ai-chat文档[https://uniapp.dcloud.net.cn/uniCloud/uni-ai-chat.html](https://uniapp.dcloud.net.cn/uniCloud/uni-ai-chat.html)
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