Update wperf-test README with current unit test results

Przemyslaw Wirkusrequested to merge
PrzemekWirkus/windowsperf:devel_unit_test_readme_update into main

Just a minor update with current unit test results. It improves docs because in previous version we had only few tests.

You can see "live" update here.

Edited by Przemyslaw Wirkus

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