add warning callout for base account signing

Author: hughescoin

docs/mini-apps/quickstart/create-new-miniapp.mdx

@@ -118,6 +118,7 @@ Now that you have a public domain for your application, you are ready to associa
     3. Click the `verify` button and follow the on screen instructions for signing with your Farcaster wallet
     4. Copy the `accountAssociation` object
 
+<Warning>The Base Account used to verify your mini app must have a Farcaster user associated with it for proper signing to occur</Warning>
 </Step>
 
 <Step title="Update `minikit.config.ts`">