Update README.md

Author: feldroop

libsais-sys/README.md

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 # libsais-sys
 
+[![Build Status](https://img.shields.io/github/actions/workflow/status/feldroop/libsais-rs/rust.yml?style=flat-square&logo=github)](https://github.com/feldroop/libsais-rs/actions)
+[![Crates.io](https://img.shields.io/crates/v/libsais-sys.svg?style=flat-square&logo=rust)](https://crates.io/crates/libsais-sys)
+[![Documentation](https://img.shields.io/docsrs/libsais-sys?style=flat-square&logo=rust)](https://docs.rs/libsais-sys)
+
 This crate contains raw bindings to the [`libsais`](https://github.com/IlyaGrebnov/libsais) C library by Ilya Grebnov. It is highly recommended to use the API wrapper [crate](https://github.com/feldroop/libsais-rs) instead.
 
 The existing `doxygen` documentation was turned into the `rustdoc` format using [doxygen-rs](https://github.com/Techie-Pi/doxygen-rs) and some custom tinkering.