update readme with debug log note

Author: eduardomourar

python/rpdk/typescript/templates/README.md

@@ -35,3 +35,5 @@ const progress: ProgressEvent = ProgressEvent.builder()
 ```
 
 While importing the [{{ lib_name }}](https://github.com/eduardomourar/cloudformation-cli-typescript-plugin) library, failures can be passed back to CloudFormation by either raising an exception from `exceptions`, or setting the ProgressEvent's `status` to `OperationStatus.Failed` and `errorCode` to one of `HandlerErrorCode`. There is a static helper function, `ProgressEvent.failed`, for this common case.
+
+Keep in mind, during runtime all logs will be delivered to CloudWatch except those used with `debug` method.