Add screencast to the README (#3)

* fix typo

* add screencast to the readme

Author: jtpio

README.md

@@ -4,6 +4,8 @@
 
 Prototype your Jupyter Widget in the browser with anywidget and JupyterLite 💡
 
+https://github.com/jtpio/anywidget-lite/assets/591645/ea0bdfc7-e1b6-433c-bf89-0a8a3c137613
+
 ## Usage
 
 Open the following link in your browser and start coding:

content/index.js

@@ -8,7 +8,7 @@ function render({ model, el }) {
     model.save_changes();
   });
   model.on("change:count", () => {
-    button.innerHTML = `COUNT is ${getCount()}`;
+    button.innerHTML = `count is ${getCount()}`;
   });
   el.appendChild(button);
 }