Missing SI Unit Prefixes in LengthUnit

[verbeen]

I'd actually expect all SI Unit prefixes to be available in this package. The PicoMeter and below are missing in the LengthUnits:

https://en.wikipedia.org/wiki/Picometre
https://en.wikipedia.org/wiki/Metric_prefix

My current concern is the missing Picometer, as I'm trying to use it. Smallest (SI unit) I can find in LengthUnit is the Nanometer.

[angularsen]

Currently, we only add the prefixes that make sense for a particular unit. We have 1000+ units and each unit adds some code, which results in the binary size being larger than I'd prefer.

You can easily add Pico prefix to the unit here:
https://github.com/angularsen/UnitsNet/blob/master/Common/UnitDefinitions/Length.json#L17

Then run generate-code.bat.

If you are interested in attempting a pull request, I'm happy to assist.