Add mixed variable many objective optimization benchmark.

[muazhari]

In this, I don't see any provided problem for mixed variable many-objective optimization ready to be benchmarked by this. Can you add it?

[blankjul]

Mixed-variable optimization is treated as an application/tutorial in pymoo as none of the algorithms have been direclty designed for this.
This is why we decided to keep the documentation separate as well.

[muazhari]

Do you mean the mixed variable example is untrue?
If so, then you should correct the docs to be more specific.

[blankjul]

Can you push a PR adding the comment that would have helped you to understand the capabilities better?

[muazhari]

I think it should not be me to contribute to the docs. I am just being confused about the information in the docs by not being explicit. If I am confused and lack understanding, I should not add/reduce the information in the docs right?