Add units library to repo

[younesr1]

Investigate using a units library like this
https://github.com/nholthaus/units

it would simplify function names like readAngleDegPerSec() and constants like maxRPM, and will generally be safer

@wmmc88 @cindyli-13 thoughts? this could be an easy task for new members

[wmmc88]

I'd prefer to just standardize units instead. Like ros has a REP that standardizes everything.

[cindyli-13]

I'm fine with either units library or standardizing units, as long as we're consistent throughout the whole repo

[younesr1]

@upadhyaydhruv for starters, create a units library and write a test-units app the shows how to use these units: Amperes, Degrees, Degrees per sec, Newtons