Added support for loading user-defined prompts template

[jerrywang121]

Description

Adding support for loading user-defined prompts template. This is to make it easier for user to apply domain specific prompts (e.g. entity types, long examples, and tweak the instructions for specific llm model) for their domains (e.g. finance, telecom).

Related Issues

None

Changes Made

Allow user to specify a yaml file prompt template to be loaded on top of default PROMPTS

• added LightRAG server support through environment variable PROMPTS_YAML_FILE and command line parameter --prompts-yaml-file
• added LightRAG core support through addon_params["prompts_yaml_file"], and load yaml and update PROMPTS during __post_init__
• updated prompt to keep record of default PROMPTS, so it can be reset if needed
• added prompts.example.yaml
• updated requirements.txt with PyYAML
• updated README

Checklist

• [x] Changes tested locally
• [x] Code reviewed
• [x] Documentation updated (if necessary)
• [ ] Unit tests added (if applicable)

Additional Notes

changes are kept minimum, hope it is OK

[jerrywang121]

Thanks Daniel for the feedback. glad to learn there is already similar (and more complete) feature planned/under dev I will surely check that out.

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This pull request has been automatically closed because it has not had recent activity.