Add IO graph

[nefelim4ag]

#237 - add the iostat output, but as i see, this is not a realtime values, just output of iostat, i.e. values from system start

Can you please add a more realtime values, if possible in graphs like CPU/Ram usage?

Thank

[tariqbuilds]

@nefelim4ag, I have no plans to add real-time iostate widget. However, pull requests are welcome.

[theburn]

@nefelim4ag you can try it #485