update readme.md

README.md

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 # jotai-scheduler
 
+<p align="center">
+  <a href="https://github.com/jotaijs/jotai-scheduler/blob/main/.github/workflows/test.yml"><img src="https://github.com/jotaijs/jotai-scheduler/actions/workflows/test.yml/badge.svg" alt="GitHub Actions status"></a>
+  <a href= "https://github.com/prettier/prettier"><img alt="code style: prettier" src="https://img.shields.io/badge/code_style-prettier-ff69b4.svg"></a>
+  <a href="https://github.com/facebook/jest"><img src="https://img.shields.io/badge/tested_with-jest-99424f.svg" alt="Tested with Jest"></a>
+  <a href="CONTRIBUTING.md#pull-requests"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg" alt="PRs Welcome"></a>
+  <a href="#license"><img src="https://img.shields.io/github/license/sourcerer-io/hall-of-fame.svg?colorB=ff0000"></a>
+</p>
+
 A Jōtai utility package for better performance.
 
 ## Install