update docs

Author: lispking

README.md

@@ -1,7 +1,14 @@
 # tokio-mpmc
 
+[![Crates.io](https://img.shields.io/crates/v/tokio-mpmc.svg)](https://crates.io/crates/tokio-mpmc)
+[![Documentation](https://docs.rs/tokio-mpmc/badge.svg)](https://docs.rs/tokio-mpmc)
+[![License: Apache 2.0](https://img.shields.io/badge/License-Apache2.0-yellow.svg)](https://opensource.org/license/apache-2-0)
+[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/lispking/tokio-mpmc/ci.yml?branch=main&style=for-the-badge" height="20">](https://github.com/lispking/tokio-mpmc/actions?query=branch%3Amain)
+
 A high-performance multi-producer multi-consumer (MPMC) queue implementation based on Tokio.
 
+![architecture](docs/architecture.png)
+
 ## Features
 
 - Asynchronous implementation based on Tokio