Missing required PDF files in Document_Summary directory

[xiiaochuang]

Hi maintainers,

I noticed that the Document_Summary directory in the project is missing a subfolder named assist_files, which seems to contain 3 required PDF files in the codebase. This omission might cause runtime errors or functionality failures for users trying to execute features dependent on these files.

    '/root/LLM/LangChain/assist_files/Chapter-10---Distribution-System_2017_Electrical-Power-Systems.pdf',
    '/root/LLM/LangChain/assist_files/Chapter-24---Renewable-Energy-Sources_2017_Electrical-Power-Systems.pdf',
    '/root/LLM/LangChain/assist_files/Chapter-20---Economic-Operation-of-Power-System_2017_Electrical-Power-System.pdf'

Suggested fixes:

1. Add the missing assist_files folder with the required PDFs to the repository.
2. If these files are sensitive or large, update the README or documentation to clarify:
   • How to obtain/generate them.
   • Their intended purpose in the workflow.
   • Any alternative steps for users to resolve the issue locally.

Please let me know if I can assist further or clarify the context!