feat: Add main analysis script and Excel metadata reader
- Implemented main.py to orchestrate the analysis of Jules Berton's letters collection. - Added read_excel_metadata.py to read and analyze the Excel file containing letter metadata. - Included functions for reading Excel files, analyzing structure, extracting letter information, and saving data to JSON. - Added error handling and user feedback for file operations and analysis steps. - Provided a summary of the analysis results and instructions for further usage.
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