Added formulas for ntopng and ndpi

Dear all, please find enclosed the formulas for two open source tools ntop develops:
- nDPI: SDK for deep-packet inspection
- ntopng: web-based traffic monitoring application.

Thanks Luca Deri
sorry, I meant can you leave the test as it was there e.g. `system "#{bin}/ndpiReader", "-i", "en0", "-s", "5"`