docs: add badges to README.md

Author: betaboon

README.md

@@ -1,3 +1,10 @@
+<p align="center">
+  <img src="https://img.shields.io/maintenance/yes/2021.svg?style=for-the-badge" alt="maintained">
+  <a href="https://github.com/material-svelte/vite-web-test-runner-plugin/blob/main/LICENSE.md"><img src="https://img.shields.io/npm/l/vite-web-test-runner-plugin.svg?style=for-the-badge" alt="license"></a>
+  <a href="https://www.npmjs.com/package/vite-web-test-runner-plugin"><img src="https://img.shields.io/npm/v/vite-web-test-runner-plugin.svg?style=for-the-badge" alt="npm package"></a>
+</p>
+<br/>
+
 # vite-web-test-runner-plugin
 
 A [@web/test-runner](https://modern-web.dev/docs/test-runner/overview/) plugin to test Vite-powered projects. This plugin automatically connects to the Vite project in the current directory, loads the project configuration, and the uses your already-configured Vite build pipeline to build each test file.