Update recently added (#641)

* Update recently added

* Update README.md

Co-authored-by: Simón Fishman <simonpfish@gmail.com>

---------

Co-authored-by: Simón Fishman <simonpfish@gmail.com>

README.md

@@ -9,6 +9,7 @@ Most code examples are written in Python, though the concepts can be applied in
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 ## Recently added/updated 🆕 ✨
+- [How to evaluate abstractive summarization](examples/evaluation/How_to_eval_abstractive_summarization.ipynb) [Aug 16, 2023]
 - [Whisper prompting guide](examples/Whisper_prompting_guide.ipynb) [June 27, 2023]
 - [Question answering using a search API and re-ranking](https://github.com/openai/openai-cookbook/blob/main/examples/Question_answering_using_a_search_API.ipynb) [June 16, 2023]
 - [How to call functions with Chat models](https://github.com/openai/openai-cookbook/blob/main/examples/How_to_call_functions_with_chat_models.ipynb) [June 13, 2023]