[FEATURE] Battery status

[derekschartung]

A battery status would be useful and have parity with fastfetch. I only have access to a Linux laptop for testing. I made a battery struct (for kicks) and considered a PR but I think this should ship for all supported platforms and is beyond my capabilities with zig.

Screenshot of it working on my system

[utox39]

Hi. That's great, go ahead and open a pull request. I'll take care of the macOS part.