docs: add required LLMConfig for Azure OpenAI

[PrettyWood]

fix #557

Important

Updates README.md to include LLMConfig setup for Azure OpenAI integration.

• Documentation:
  • Adds import for LLMConfig in README.md for Azure OpenAI setup.
  • Introduces LLMConfig creation with Azure model names in README.md.
  • Updates Graphiti initialization example to include llm_config for OpenAIClient and OpenAIRerankerClient.

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[danielchalef]

All contributors have signed the CLA ✍️ ✅
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[ellipsis-dev]

Important

Looks good to me! 👍

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1. README.md:208

• Draft comment:
  Good addition: importing LLMConfig improves clarity for Azure configuration.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 80% None

2. README.md:225

• Draft comment:
  Instantiating azure_llm_config with deployed Azure model names is clear. Ensure these names match your deployment.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 80% None

3. README.md:237

• Draft comment:
  Passing azure_llm_config to both the LLM client and cross encoder promotes consistency in configuration.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 80% None

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[PrettyWood]

I have read the CLA Document and I hereby sign the CLA