readme更新

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2022-03-04 1f39c6c62f0d20f8798b699e8525b5c8d8684367

readme更新

 README.md

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![build_1.png](https://images.gitee.com/uploads/images/2022/0304/101823_19050c66_1018729.png "2022-03-04_10-12_1.png")
![build_1.png](https://images.gitee.com/uploads/images/2022/0304/101848_e5a39557_1018729.png "2022-03-04_10-12_2.png")
![build_1.png](https://images.gitee.com/uploads/images/2022/0304/101919_ee5b8c79_1018729.png "2022-03-04_10-13.png"")
![build_1.png](https://images.gitee.com/uploads/images/2022/0304/101919_ee5b8c79_1018729.png "2022-03-04_10-13.png")

# 1.0 基础特性  
1. 视频预览;