Create Gazebo world

[adam-slucki]

There is already one world created but it uses only assets available in Gazevo library.
It would be more realistic to create our own assets (maybe recreate some parts of our offices?).

Creating worlds with static objects or Gazebo can be quite relaxing. It may involve modifying 3D models obtained from various sources like https://www.turbosquid.com/ in blender or similar software.