Add process network usage

[GuillaumeGomez]

On linux, it is in /proc/[pid]/net/dev.
On OSX, [to be determined...].
On windows: https://stackoverflow.com/questions/44689482/how-to-monitor-process-network-usage-under-windows.

[adonagy]

Any updates on this front? :)

[GuillaumeGomez]

Not at all. :)

[haixuanTao]

If you want, I can make a pull request on the Linux process network. I would not be able to implement the network usage for the other OS. would that work for you? Or do you prefer to implement it if you have a clear view on how to implement for all of them?

[GuillaumeGomez]

It's welcome but I won't merge it until all OSes have it implemented as well (just so that you're aware).

[haixuanTao]

Make sense. Thanks for the blazing fast reply :)