Add example of using multiple controller managers under different namespaces.

[destogl]

[destogl]

@jackcenter

Thanks for the review!

It seems that I have broke rrbot.launch.py example. I just fixed this, and it should work again now. I had some unintentional change still in the code.

Nevertheless, the “namespace” examples are updated, i.e., manual is updated, can you please check one more time? (I don't want to give you further details to “simulate” how a new user would approach the examples. — I am glad to give them to you after test if you are interested, but hopefully the README should be sufficient.)

And yes, this works currently only when ros2_control and ros2_controllers are compiled from source and with newest rolling on 22.04.

[destogl]

Looks like everything works, and the simulations look cool! I wrote a few thoughts about the README organization.

@jackcenter thanks for the thorough review!

[mergify[bot]]

This pull request is in conflict. Could you fix it @destogl?

[christophfroehlich]

Closing in favor of #423