Update README.md

Author: FreerGit

README.md

@@ -1,3 +1,7 @@
+[![build & test](https://github.com/freergit/ring-log/actions/workflows/ci.yml/badge.svg)](https://github.com/freergit/ring-log/actions/workflows/ci.yml)
+[![Crates.io](https://img.shields.io/crates/v/ring-log?style=flat-square)](https://crates.io/crates/ring-log/versions)
+[![license](https://img.shields.io/github/license/freergit/ring-log)](https://github.com/freergit/ring-log/blob/main/LICENSE.txt)
+
 # fast-log
 High-performance logger with lock-free ring buffer, use this library when you want to log in the hotpath and performance is critical.
 
@@ -21,4 +25,4 @@ logger.log_f(|| format_log!("To log.txt {}", 5)); // path/to/file:LINE: To log.t
 
 // Blocks until all logs are handled.
 logger.shutdown();
-```
+```