add ROS environment#1

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armorsun wants to merge 2 commits intoNTU-ToolmenLab:masterfrom

armorsun:ros-environment

Commits on Jun 15, 2020

add ROS environment
armorsun
committed

Commits on Jun 30, 2020

replace the vnc server from vnc4server to x11vnc to launch rviz correctly
armorsun
committed