Add pptx-plugin

plugins/pptx-plugin/README.md

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+# PPTX Plugin
+
+## Quick Reference
+
+| Task | Guide |
+|------|-------|
+| Read/analyze content | `python -m markitdown presentation.pptx` |
+| Edit or create from template | Read `ppt-editing-skill` |
+| Create from scratch | Use subagents + PptxGenJS, see below |
+
+---
+
+## Reading Content
+
+```bash
+# Text extraction
+python -m markitdown presentation.pptx
+```
+
+---
+
+## Editing Workflow
+
+**Read `ppt-editing-skill` for full details.**
+
+1. Analyze template with `markitdown`
+2. Unpack → manipulate slides → edit content → clean → pack
+
+---
+
+## Creating from Scratch
+
+**Use when no template or reference presentation is available.**
+
+1. Search to understand user requirements
+2. Use color-font-skill to select palette and fonts
+3. Read ppt-orchestra-skill to design your PPT outline
+4. Spawn subagents to create slide JS files (max 5 concurrent)
+5. Compile all slide modules into final PPTX
+
+### Subagent Types
+
+- `cover-page-generator` - Cover slide
+- `table-of-contents-generator` - TOC slide
+- `section-divider-generator` - Section transition
+- `content-page-generator` - Content slides
+- `summary-page-generator` - Summary/CTA slide
+
+### Output Structure
+
+```
+slides/
+├── slide-01.js          # Slide modules
+├── slide-02.js
+├── ...
+├── imgs/                # Images used in slides
+└── output/              # Final artifacts
+    └── presentation.pptx
+```
+
+### Tell Subagents
+
+1. File naming: `slides/slide-01.js`, `slides/slide-02.js`
+2. Images go in: `slides/imgs/`
+3. Final PPTX goes in: `slides/output/`
+4. Dimensions: 10" × 5.625" (LAYOUT_16x9)
+5. Fonts: Chinese=Microsoft YaHei, English=Arial
+6. Colors: 6-char hex without # (e.g. `"FF0000"`)
+
+---
+
+## QA & Dependencies
+
+See **ppt-orchestra-skill** for QA process and dependencies.