feat: add build status

README.md

@@ -1044,7 +1044,7 @@ See also [About Rust’s Machine Learning Community](https://medium.com/@autumn_
     * [bonifaido/rust-zookeeper](https://github.com/bonifaido/rust-zookeeper) [[zookeeper](https://crates.io/crates/zookeeper)] — A client library for Apache ZooKeeper. [![build badge](https://api.travis-ci.org/bonifaido/rust-zookeeper.svg?branch=master)](https://travis-ci.org/bonifaido/rust-zookeeper)
     * [krojew/rust-zookeeper](https://github.com/krojew/rust-zookeeper) [[zookeeper-async](https://crates.io/crates/zookeeper-async)] - Async Zookeeper client written 100% in Rust, based on tokio.  ![build status](https://github.com/krojew/rust-zookeeper/actions/workflows/rust.yml/badge.svg)
   * [PoloDB](https://www.polodb.org/)
-    * [vincentdchan/PoloDB](https://github.com/vincentdchan/PoloDB) - An embedded JSON-based database has API similar to MongoDB.
+    * [vincentdchan/PoloDB](https://github.com/vincentdchan/PoloDB) - An embedded JSON-based database has API similar to MongoDB. ![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/vincentdchan/PoloDB/rust.yml)
 * OGM [[ogm](https://crates.io/keywords/ogm)]
     * [Aragog](https://gitlab.com/qonfucius/aragog) [[aragog](https://crates.io/crates/aragog)] - A Lightweight ArangoDB Object document, relational and graph mapper [![pipeline status](https://gitlab.com/qonfucius/aragog/badges/master/pipeline.svg)](https://gitlab.com/qonfucius/aragog/-/commits/master)
 * ORM [[orm](https://crates.io/keywords/orm)]