Added Wizard Example

Author: erikras

README.md

@@ -123,6 +123,7 @@ const MyForm = () => (
   * [Field Warnings](#field-warnings)
   * [Reusable Field Groups](#reusable-field-groups)
   * [External Submit](#external-submit)
+  * [Wizard Form](#wizard-form)
 * [Rendering](#rendering)
 * [API](#api)
   * [`Field : React.ComponentType<FieldProps>`](#field--reactcomponenttypefieldprops)
@@ -277,6 +278,11 @@ Demonstrates how you can use `document.getElementById()` or a closure to trigger
 a submit from outside of the form. For more information, see
 [How can I trigger a submit from outside the form?](docs/faq.md#how-can-i-trigger-a-submit-from-outside-my-form)
 
+### [Wizard Form](https://codesandbox.io/s/km2n35kq3v)
+
+Demonstrates how to use 🏁 React Final Form to create a multi-page "wizard"
+form, with validation on each page.
+
 ## Rendering
 
 There are three ways to tell `<Form/>` and `<Field/>` what to render: