feat(retries): update readme

Author: Natan Tolparov

README.md

@@ -166,6 +166,14 @@ from yandexcloud import SDK, RetryPolicy
 sdk = SDK(retry_policy=RetryPolicy())
 ```
 
+SDK provide different modes for retry throttling policy:
+
+* `persistent` is suitable when you use SDK in any long-lived application, when SDK instance will live long enough for manage budget;
+* `temporary` is suitable when you use SDK in any short-lived application, e.g. scripts or CI/CD.
+
+By default, SDK will use temporary mode, but you can change it through `throttling_mode` argument.
+
+
 ## Contributing
 ### Dependencies
 We use [uv](https://docs.astral.sh/uv) to manage dependencies and run commands in Makefile.