xrunits 0.1.2

A strong type unit library
Documentation 
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# XRUnits

XRUnits is a unit library
# **My english is NOT very good !!**

## Motivation

We usually use some real-world unit.
If we need to develop a program to deal with these units,
like creating a downloader which need to calculate the
data transfer speed or set the frequency of MCU,we need
do lots of duplicate works to convert these unit, so I want
to develop a unit library with STRONG TYPE and Easily using
to deal with these situations.
## Details

To avoid duplicate code,I use lots of macro to automatically
generate code.
## Examples

To create 2Kg
```
# use xrunits::mass::BuildKilogram;

let mass = 2.kg();
```
Convert it to ton and gram
```
# use xrunits::mass::{Ton, BuildKilogram, Gram};

# use xrunits::CastTo;

let mass : Ton = 2.kg().cast_to();
let mass : Gram = mass.cast_to();
```
Print to screen
```
# use xrunits::time::BuildSecond;

println!("time:{}",3.sec()); //time:3s
```
Calculate the Frequency from Period
```
# use xrunits::time::{BuildMicrosecond, IntoFrequency};

# use xrunits::frequency::Megahertz;

let us = 1.us();
let mhz : Megahertz = us.into_frequency();
```