chore: add group to readme

packages/prompts/README.md

@@ -120,3 +120,36 @@ s.start('Installing via npm');
 // Do installation
 s.stop('Installed via npm');
 ```
+
+## Utilities
+
+### Grouping
+
+Grouping prompts together is a great way to keep your code organized. This accepts a JSON object with a name that can be used to reference the group later. The second argument is an optional but has a `onCancel` callback that will be called if the user cancels one of the prompts in the group.
+
+```js
+import * as p from '@clack/prompts'
+
+const group = await p.group({
+  name: () => p.text({ message: "What is your name?" }),
+  age: () => p.text({ message: "What is your age?" }),
+  color: ({ results }) => p.multiselect({
+    message: `What is your favorite color ${results.name}?`,
+    options: [
+      { value: 'red', label: 'Red' },
+      { value: 'green', label: 'Green' },
+      { value: 'blue', label: 'Blue' },
+    ],
+  })
+},
+{
+  // On Cancel callback that wraps the group
+  // So if the user cancels one of the prompts in the group this function will be called
+  onCancel: ({ results }) => {
+    p.cancel('Operation cancelled.')
+    process.exit(0)
+  }
+})
+
+console.log(group.name, group.age, group.color)
+```