Added image showing agreement ID

Author: clairekinde11

src/content/docs/billing/manage-subscribers/add-metered-usage.mdx

@@ -31,6 +31,8 @@ Adding usage values requires two key pieces of information:
 
 - Via the Kinde UI - Open the user or organization record in Kinde and select **Billing** in the menu. The customer agreement shows as part of the subscription details. 
 
+![Example of agreement ID in Kinde](https://imagedelivery.net/skPPZTHzSlcslvHjesZQcQ/6488a69d-a47d-413b-a3b3-47a39398b600/public)
+
 ## Get the feature ID
 
 1. Open the plan the feature belongs to.