Add spotpdf

[Hyperrick]

Link to the service, library or dataset

https://github.com/Hyperrick/spotpdf

Category under which the entry should appear

• Parsers, OCR and extraction
• Readers and viewers
• Creation and production
• Accessibility
• Datasets

Brief description of the entry

MIT-licensed Python CLI and library to inspect, remove, rename, remap, and convert supported PDF spot colors without rasterizing pages. Unsupported selected uses fail closed without publishing partial output.