tests: xtimer_usleep: provide README

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Martine Lenders 2017-10-24 17:15:40 +02:00
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# xtimer_usleep test application
This test tests `xtimer_usleep()` both against the timings of
`xtimer_now_usec()` and by providing capabilities to compare against an external
timer.
## Usage
```
make flash test
```