ROS knowledge points - ROS create workspace

Reference resources ：
file 1：https://blog.csdn.net/ck784101777/article/details/106297924
file 2：https://blog.csdn.net/qq_43569735/article/details/108038384（ More recommended ）

bug1： file 1, step 1.1 in , Create workspace directives

Original instruction ：

$ source /opt/ros/kinetic/setup.bash

Because mine is 18.04 So we need to change it to ：

$ source /opt/ros/melodic/setup.bash

bug2： file 1, step 1.1 in , There is no prompt for successful creation

Execution instruction ：

$ catkin_init_workspace

Create success , Tips ：

Creating symlink "/home/wuhd/catkin_ws/src/CMakeLists.txt" pointing to "/opt/ros/melodic/share/catkin/cmake/toplevel.cmake"