Provide scientific documentation

[pattacini]

It'd be a nice addition to the sandbox a brief writeup describing the architecture under the hood.

To this end, we may consider publishing the writeup on GitHub Pages (in master under /docs).
Once done, remember to enable the Environment section within the About.

Further, point out that the demo is designed in such a way that it can be run only in one-shot mode.

As closing remarks, sketch out how the sandbox may be used as a playground to test new ideas 💡

Don't forget to add pointers to the related scientific papers on geometric-based grasping:

• https://ieeexplore.ieee.org/document/8625030
• https://journals.sagepub.com/doi/10.1177/1729881419831846

[pattacini]

Documentation is available at https://robotology.github.io/icub-gazebo-grasping-sandbox.