Add how to run evaluation.py (LangSmith api key is needed)

[madina1203]

PR Type

documentation, enhancement

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Description

• Update error message for missing API keys

• Add LangSmith evaluation instructions to README

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Diagram Walkthrough

flowchart LR
  A["evaluation.py"] -- "Update error message" --> B["Improved guidance"]
  C["README.md"] -- "Add evaluation instructions" --> D["LangSmith setup"]

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File Walkthrough

	Relevant files
Enhancement	evaluation.py Improve error message for API key setup                                    app/core/tests/evaluation.py Update error message for missing API keys Provide guidance on adding API keys +1/-1
Documentation	README.md Document LangSmith evaluation setup in README                        README.md Add section for LangSmith automated evaluation Include instructions for running evaluation script +4/-0

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