更新README.md文件

README.md

@@ -3,8 +3,9 @@
 git clone -b linux-dev https://code.xturtle.cn/corvin_zhang/mini_6dof_imu.git
 ```
 
-#### 编译
+#### 编译serial_6dof_imu
 ```
+cd serial_6dof_imu
 mkdir build
 cd build
 cmkae ..