[Feature request] adding in read throughput benchmark

[Proryanator]

This tool is really awesome.

I think adding in max read speeds into this tool would be super helpful. For example, I can read upwards of 3GB/s from one of my M.2 ssd's, and would love for this tool to tell me that. I can see this in Task Manager or Samsung's Magician software when I'm reading a 4K video file.

I'm working on a video encode benchmarking tool written in Rust that has high sequential read speed requirements for > 2K@60fps video content, that I'd love to reference or bundle your tool in to determine if someone's machine would be i/o bottlenecked.

Note: if this would fall under the other existing issue #15 feel free to close this out.