Add a guide to benchmark configuration options

[qurbonzoda]

Followup to #167

The changes were developed within GSoC 2023 program by our mentee @wldeh.

[fzhinkin]

The documentation is great, but it is missing examples. It would be nice to put a reference to some sample project, site its configuration and then describe what to expect.
For instance, "here's a project with multiple benchmarks; we're excluding this and including that; here's what will be actually executed and here's a sample of an output".

[fzhinkin]

Oh, and the jhmVersion property is not documented here. Given the really old version used by default (1.21), it's necessary to mention how to switch to a more up-to-date version.

[qurbonzoda]

Oh, and the jhmVersion property is not documented here. Given the really old version used by default (1.21), it's necessary to mention how to switch to a more up-to-date version.

@fzhinkin, Done. PTAL.