MarkItDown library is a utility tool for converting various files to Markdown
(e.g., for indexing, text analysis, etc.)

It presently supports:
  *PDF (.pdf)
  *PowerPoint (.pptx)
  *Word (.docx)
  *Excel (.xlsx)
  *Images (EXIF metadata, and OCR)
  *Audio (EXIF metadata, and speech transcription)
  *HTML (special handling of Wikipedia, etc.)
  *Various other text-based formats (csv, json, xml, etc.)
  *ZIP (Iterates over contents and converts each file)