Update README.md

Author: clouds56

README.md

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 crnlib
 ========
+[![crates.io](https://img.shields.io/crates/v/crnlib.svg)](https://crates.io/crates/crnlib)
+[![Documentation](https://docs.rs/crnlib/badge.svg)](https://docs.rs/crnlib)
+[![Build Status](https://github.com/clouds56/crnlib/workflows/Rust/badge.svg)](https://github.com/clouds56/crnlib/actions)
+
+
 This is a port from [crunch/crnlib](https://github.com/BinomialLLC/crunch), the license could be found at the end of file.
 
 Feel free to open a issue about usage and/or features to make it better to use. Now (Jan 2021) it still works well for my specific usage.