Benchmarks

[nim65s]

As stated by @proyan in stack-of-tasks/tsid#9 (comment) :

We should have benchmarks for the 3 solvers proposed here, and other similar projects available on the web.

[nim65s]

(self-assigning this, but it's not really high priority on my todolist, so if anyone wants to do that don't hesitate :) )

[asherikov]

I did some benchmarking against my solver https://github.com/asherikov/qpmad_benchmark, feedback is welcome. It would be nice to include your typical problems as well.