describe usage of rosbot demo with o3de binary

[boczekbartek]

Purpose

Add documentation of using the binary release of the https://github.com/RobotecAI/rai-rosbot-xl-demo demo.

Proposed Changes

• adds docs

Issues

Testing

• went through added docs
• the window with the simulation was opened
• rosbot performed actions in response to submitted tasks

[boczekbartek]

Thanks for adding missing dependencies! Good catch 👍🏼