ROS2 Galactic version

[airballking]

Dear @k-okada,

I have one of my students working on a ROS2 galactic version of this package. Would you be interested in reviewing and merging a pull request, once we are done?

Greetings from Bremen,
Georg.

[k-okada]

@airballking Hi, I personally do not use ROS2, but we always welcome merging PR.