Add badge of cdn source (#45)

Author: Max-ChenFei

README.md

@@ -5,10 +5,14 @@ help.
 
 [![Extension status](https://img.shields.io/badge/status-ready-success 'The package is ready to be used')](https://jupyterlab-contrib.github.io/)
 [![NPM Version](https://img.shields.io/npm/v/@jupyter-notebook/web-components?color=blue)](https://www.npmjs.com/package/@jupyter-notebook/web-components)
+[![Extension status](https://img.shields.io/badge/cdn-jsdelivr-brightgreen)](https://www.jsdelivr.com/package/npm/@jupyter-notebook/web-components)
+[![Extension status](https://img.shields.io/badge/cdn-unpkg-brightgreen)](https://unpkg.com/browse/@jupyter-notebook/web-components/)
+
 [![Toolkit CI Status](https://github.com/jupyterlab-contrib/jupyter-ui-toolkit/actions/workflows/ci.yml/badge.svg)](https://github.com/jupyterlab-contrib/jupyter-ui-toolkit/actions/workflows/ci.yml)
 [![Deploy Docs Status](https://github.com/jupyterlab-contrib/jupyter-ui-toolkit/actions/workflows/docs-cd.yml/badge.svg)](https://jupyterlab-contrib.github.io/jupyter-ui-toolkit/)
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/jupyterlab-contrib/jupyter-ui-toolkit/main)
 
+
 ![Toolkit for Jupyter Artwork](https://raw.githubusercontent.com/jupyterlab-contrib/jupyter-ui-toolkit/main/packages/components/docs/assets/toolkit-artwork.png)
 
 [Explore the components](https://jupyterlab-contrib.github.io/jupyter-ui-toolkit/) | [Online JupyterLab demo](https://mybinder.org/v2/gh/jupyterlab-contrib/jupyter-ui-toolkit/main)