Add Nutrient Document Processing skill

API-backed document processing skill by Nutrient (formerly PSPDFKit):
- Document conversion (PDF, DOCX, XLSX, PPTX, HTML, images)
- Text/table/key-value extraction
- OCR in 20+ languages
- Pattern-based + AI-powered PII redaction
- Watermarks, digital signatures, form filling
- MCP server also available

Repo: https://github.com/PSPDFKit-labs/nutrient-agent-skill
Apache-2.0 licensed

README.md

@@ -287,6 +287,7 @@ Official AI agent skills from the Expo team for building, deploying, and debuggi
 
 ### Productivity and Collaboration
 
+- **[PSPDFKit-labs/nutrient-agent-skill](https://github.com/PSPDFKit-labs/nutrient-agent-skill)** - Document processing with Nutrient DWS API: convert (PDF/DOCX/XLSX/PPTX/HTML/images), extract text/tables, OCR (20+ languages), redact PII (pattern + AI), watermark, digital signatures, form filling. [MCP server](https://www.npmjs.com/package/@nutrient-sdk/dws-mcp-server) also available.
 - **[notiondevs/Notion Skills for Claude](https://www.notion.so/notiondevs/Notion-Skills-for-Claude-28da4445d27180c7af1df7d8615723d0)** - Skills for working with Notion
 - **[op7418/NanoBanana-PPT-Skills](https://github.com/op7418/NanoBanana-PPT-Skills)** - AI-powered PPT generation with document analysis and styled images
 - **[zarazhangrui/frontend-slides](https://github.com/zarazhangrui/frontend-slides)** - Generate animation-rich HTML presentations with visual style previews