Update readme.md

NengchaoPan · Aug 14, 2020 · a8d7193 · a8d7193
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 # 2. 李群李代数知识
+[【Sophus库 学习笔记 1】 Sophus的安装与使用 基础知识](https://blog.csdn.net/wb790238030/article/details/88014059?utm_medium=distribute.pc_relevant.none-task-blog-baidulandingword-8&spm=1001.2101.3001.4242)
 
 [李群李代数 反对称矩阵 指数映射 对数 刚体变换群SE3](https://blog.csdn.net/x_r_su/article/details/52749616)