Add Netwrap description to example/README
Add Netwrap description to example/README

Signed-off-by: Bogdan Pricope <385103c4eae27e55111df6ab7856eefb0647e14e@enea.com>
Reviewed-by: Antero Nousiainen <c3a357588030f529ecf72b6fa88c0350579fbee8@nokia.com>

OpenFastPath/ofp,TolikH/ofp,TolikH/ofp,OpenFastPath/ofp,OpenFastPath/ofp,TolikH/ofp,OpenFastPath/ofp