Update README.md

Co-authored-by: Greg Brimble <developer@gregbrimble.com>

README.md

@@ -39,6 +39,8 @@ GitHub Action for creating Cloudflare Pages deployments, using the new [Direct U
 ### Get account ID
 To find your account ID, log in to the Cloudflare dashboard > select your zone in Account Home > find your account ID in Overview under **API** on the right-side menu. If you have not added a zone, add one by selecting **Add site** . You can purchase a domain from [Cloudflare’s registrar](https://developers.cloudflare.com/registrar/). 
 
+If you do not have a zone registered to your account, you can also get your account ID from the `pages.dev` URL. E.g: `https://dash.cloudflare.com/<ACCOUNT_ID>/pages`
+
 ### Generate an API Token
 To generate an API token:
 1. Log in to the Cloudflare dashboard.