metrics: Add info about PnP failure report tool
metrics: Add info about PnP failure report tool

README file describes what is report tool
and how use it.

Signed-off-by: Mario Alfredo Carrillo Arevalo <962470f5d16f97233f38b7e7baf23f990a7fbec3@intel.com>

devimc/tests,chavafg/tests,MarioCarrilloA/tests,GabyCT/tests,devimc/tests,sboeuf/tests,bwarden/tests,MarioCarrilloA/tests,GabyCT/tests,chavafg/tests,bwarden/tests,sboeuf/tests,clearcontainers/tests,clearcontainers/tests