Added instrumentation callbacks description file. Somebody please check it for grammar, spelling and correspondence with current instrumentation code.
Added instrumentation callbacks description file.
Somebody please check it for grammar, spelling and correspondence
with current instrumentation code.

marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet