add references sections

[slivingston]

It would be useful to include references about the robots, e.g., GitHub repositories for source code of ROS packages etc. of multi_kobuki and basic_openmanipulator_p.

This is motivated because some robots have a variety of corresponding repositories, such as legacy ROS1 support vs. recent work on ROS2.

[slivingston]

dump of my notes about current references for multi_kobuki

work on ROS2 for Kobuki, https://github.com/kobuki-base/kobuki_ros_interfaces

Reading about getting Kobuki working on ROS Melodic distribution:
turtlebot/turtlebot#272
https://github.com/yujinrobot/kobuki_msgs/tree/release/0.7-melodic
yujinrobot/kobuki#399
yujinrobot/kobuki#394

https://github.com/yujinrobot/kobuki/tree/melodic

https://docs.google.com/document/d/15k7UBnYY_GPmKzQCjzRGCW-4dIP7zl_R_7tWPLM0zKI/edit#
http://files.yujinrobot.com/kobuki/firmware

saved through work on kobuki-base/kobuki_core#9

[stonier]

For reference, kobuki code for ROS2 has completely migrated to the https://github.com/kobuki-base organisation. There is also a documentation effort, bringing all the disparate pieces into one place, https://kobuki.readthedocs.io/en/devel/.