Update README.md

Author: rodydavis

README.md

@@ -20,6 +20,22 @@ Here's [the online demo](https://flutter-ai-toolkit-examp-60bad.web.app/) hostin
 The [source code for this demo](https://github.com/flutter/ai/blob/main/example/lib/demo/demo.dart) is available in the repo.
 
 ## Getting started
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+<a href="https://idx.google.com/new?template=https%3A%2F%2Fgithub.com%2Fflutter%2Fai">
+  <picture>
+    <source
+      media="(prefers-color-scheme: dark)"
+      srcset="https://cdn.idx.dev/btn/try_light_32.svg">
+    <source
+      media="(prefers-color-scheme: light)"
+      srcset="https://cdn.idx.dev/btn/try_dark_32.svg">
+    <img
+      height="32"
+      alt="Try in IDX"
+      src="https://cdn.idx.dev/btn/try_purple_32.svg">
+  </picture>
+</a>
+
 **1. Installation**
 Add the following dependencies to your `pubspec.yaml` file: