README update required

[xaki23]

the readme is pretty badly out of date by now.

• build status
• build process
• features/options
• tuning

[xaki23]

added the "help wanted" because i have no idea who the current target audience is really.
if you are using dpdkcap in any way, please speak up!
i would like to hear about your usecase!
and perhaps we even can get some low-key community chat going, i am game for irc, discord, matrix, whatever.

[xaki23]

and, checking insights -> network ... looking at @bogdann29 and @mandesero in particular, i didnt have you on my radar at all!