Custom service for Glances integration

[jonaskoperdraat]

Is your feature request related to a problem? Please describe.
I'd love to see load stats on my Glances dashboard item. Would that be something you'd be interested in adding to the project?

Describe the solution you'd like
Glances provides an API that exposes various statistics. One endpoint, api/3/load contains the load stats:

{
"min1": 0.2890625,
"min5": 0.248046875,
"min15": 0.2578125,
"cpucore": 4
}

I'd love to take that data and make it into a lovely dashboard item. Probably adding some color coding for low, medium and high levels.
It should probably only fetch the stats once, upon page load.

Describe alternatives you've considered
Currently, my Glances dashboard item is plain. I don't think there ar any feasible alternatives.

Additional context
I might be able to develop this feature and create a PR.