add readme

`SourceArn` as `*` is not recommended.
fujiwara · Apr 19, 2024 · 6ff99a1 · 6ff99a1
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@@ -624,6 +624,8 @@ See also [Restricting access to an AWS Lambda function URL origin](https://docs.
 
 If you need to allow access from any CloudFront distributions in your account, you can specify `SourceArn` as `arn:aws:cloudfront::123456789012:distribution/*`.
 
+Specifying `SourceArn` as `*` is not recommended because it allows access from any CloudFront distribution in any AWS account.
+
 ## LICENSE
 
 MIT License