Add app homepage URL step to README

Author: amygdalama

README.md

@@ -10,7 +10,7 @@ You will need a [WorkOS account](https://dashboard.workos.com/signup).
 
 ## Running the example
 
-1. In the [WorkOS dashboard](https://dashboard.workos.com), head to the Redirects tab and create a [sign-in callback redirect](https://workos.com/docs/user-management/1-configure-your-project/configure-a-redirect-uri) for `http://localhost:3000/callback`.
+1. In the [WorkOS dashboard](https://dashboard.workos.com), head to the Redirects tab and create a [sign-in callback redirect](https://workos.com/docs/user-management/1-configure-your-project/configure-a-redirect-uri) for `http://localhost:3000/callback` and set the app homepage URL to `http://localhost:3000`.
 
 2. After creating the redirect URI, navigate to the API keys tab and copy the _Client ID_ and the _Secret Key_. Rename the `.env.local.example` file to `.env.local` and supply your Client ID and API key as environment variables.