Add JupyterLite badge to README (#73)

* Add JupyterLite badge to README

* Add notebook to requirements

Author: jtpio

README.md

@@ -1,6 +1,7 @@
 # jupyterlab-quickopen
 
 [![Extension status](https://img.shields.io/badge/status-ready-success 'ready to be used')](https://jupyterlab-contrib.github.io/)
+[![lite-badge](https://jupyterlite.rtfd.io/en/latest/_static/badge.svg)](https://jupyterlab-contrib.github.io/jupyterlab-quickopen/lab/index.html)
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/jupyterlab-contrib/jupyterlab-quickopen/main?urlpath=lab%2Ftree%2Fbinder%2Ftutorial.ipynb)
 
 Quickly open a file in JupyterLab by typing part of its name

demo/requirements.txt

@@ -1,3 +1,4 @@
 jupyterlite-core
 jupyterlite-pyodide-kernel
+notebook
 ..