Add self-critique prompt optimization notebook

[ai-naymul]

ref: #1110

@Giom-V @patrickloeber

[review-notebook-app]

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[Giom-V]

/gemini review

[gemini-code-assist]

Code Review

The pull request introduces a new notebook demonstrating self-critique prompt optimization, which is a valuable addition to the examples. The README.md update correctly references the new notebook. However, there are a few areas in the new notebook that could be improved to align with the established style guide and best practices for Colab notebooks.

[ai-naymul]

@Giom-V I have fixed those formatting issue pls check

[kkorpal]

Hi @ai-naymul, thank you for adding this self-critique optimization notebook! It's a fantastic prompting technique to include in the cookbook.Thank you for quickly addressing the bot's style feedback and cleaning up the accidentally pushed .env file. Since the formatting looks good now, we are going to do a thorough read-through of the actual notebook content and code. We will let you know. Thanks