Add badges to README.

Author: Berrysoft

README.md

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 # Compio
 
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/Berrysoft/compio/blob/master/LICENSE)
+[![crates.io](https://img.shields.io/crates/v/compio)](https://crates.io/crates/compio)
+[![docs.rs](https://img.shields.io/badge/docs.rs-compio-latest)](https://docs.rs/compio)
+[![Azure DevOps builds](https://strawberry-vs.visualstudio.com/compio/_apis/build/status/Berrysoft.compio?branch=master)](https://strawberry-vs.visualstudio.com/compio/_build)
+
 A thread-per-core Rust runtime with IOCP/io_uring.
 The name comes from "completion-based IO".
 This crate is inspired by [monoio](https://github.com/bytedance/monoio/).