update readme

Author: Liansheng-Wang

README.md

@@ -67,4 +67,8 @@ rosrun lio_lite test_load
 ![SplitMap](https://github.com/Liansheng-Wang/LIO-Lite/blob/eskf-base/doc/split_map.png)
 
 ### 2023-11-22
-Added the use of gravity as a constraint to define the horizontal plane during the initialization phase.
+Added the use of gravity as a constraint to define the horizontal plane during the initialization phase.
+
+### 2023-11-23
+Test HesaiXT-16 Lidar.
+![HesaiTX16](https://github.com/Liansheng-Wang/LIO-Lite/blob/eskf-base/doc/HesaiXT16.png)

README_CN.md

@@ -62,4 +62,8 @@ rosrun lio_lite test_load
 ![SplitMap](https://github.com/Liansheng-Wang/LIO-Lite/blob/eskf-base/doc/split_map.png)
 
 ### 2023-11-22
-增加了在初始化阶段以重力为约束定义水平面.  
+增加了在初始化阶段以重力为约束定义水平面.  
+
+### 2023-11-23
+测试了 HesaiXT-16 雷达.
+![HesaiTX16](https://github.com/Liansheng-Wang/LIO-Lite/blob/eskf-base/doc/HesaiXT16.png)