Add badges to readme

Author: eldruin

README.md

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+[![crates.io](https://img.shields.io/crates/d/linux-embedded-hal.svg)](https://crates.io/crates/linux-embedded-hal)
+[![crates.io](https://img.shields.io/crates/v/linux-embedded-hal.svg)](https://crates.io/crates/linux-embedded-hal)
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 # `linux-embedded-hal`
 
 > Implementation of the [`embedded-hal`] traits for Linux devices