Create README.md

Author: keychron-dev

P-Ultra-8K-Series/P6-Ultra-8K/README.md

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+# Keychron P6 Ultra 8K — Hardware Design Files
+
+> 100% full-sized wireless custom mechanical keyboard with a full-metal body, 8K polling, ZMK firmware, and a rapid-assembly screwless structure.
+
+**Product page:** [Keychron P6 Ultra 8K](https://www.keychron.com/products/keychron-p6-ultra-8k-wireless-custom-mechanical-keyboard)
+
+![P6 Ultra 8K](https://www.keychron.com/cdn/shop/files/P6-Ultra-Iconic-Features.jpg?crop=center&height=1200&v=1767005341&width=1200)
+
+## Current Repository Status
+
+This folder already includes the following hardware design assets for the ANSI / US version:
+
+| File | Description | Format |
+|---|---|---|
+| `P6-Ultra-8K-US-Cherry-Profile-Keycap-Full-Model-20260130.stp` | Full 3D model with Cherry-profile keycaps | STEP |
+| `P6-Ultra-8K-US-Plate-20260413.dwg` | Plate drawing for CAD workflows | DWG |
+| `P6-Ultra-8K-US-Plate-20260413.dxf` | Plate drawing for laser/CAD compatibility workflows | DXF |
+| `P6-Ultra-8K-US-Plate-20260413.pdf` | Plate reference drawing for quick viewing | PDF |
+
+## Product Snapshot
+
+| Spec | Detail |
+|---|---|
+| Layout | 100% / full size |
+| Knob | Yes |
+| Case Material | Full metal |
+| Connectivity | 2.4 GHz / Bluetooth 5.3 / USB-C wired |
+| Polling Rate | Up to 8,000 Hz |
+| Firmware | ZMK |
+| Mount Style | Gasket |
+| Keycaps | Cherry profile double-shot PBT |
+| Switch Support | MX-style hot-swappable |
+
+## Typical File Uses
+
+| File Type | Typical Use |
+|---|---|
+| `stp` | Full assembly, case, plate, or accessory 3D CAD work |
+| `dwg` / `dxf` | Plate geometry, manufacturing references, and accessory fitting |
+| `pdf` | Quick-view drawings and dimension reference |
+
+## Opening the Files
+
+| Format | Free Software | Commercial Software |
+|---|---|---|
+| `.stp` | FreeCAD, Onshape | Fusion 360, SolidWorks |
+| `.dwg` / `.dxf` | LibreCAD, QCAD | AutoCAD, DraftSight |
+| `.pdf` | Any PDF viewer | — |
+
+## Notes
+
+- The currently uploaded files are for the US / ANSI plate and full-model variant.
+- File names include date stamps to make revision tracking easier as additional variants are added.
+- If more case, PCB, or regional-layout files are released later, they can be added alongside the current assets in this folder.
+
+## Links
+
+- [Main Repository](https://github.com/Keychron/Keychron-Keyboards-Hardware-Design)
+- [Keychron Open Source Designs](https://www.keychron.com/collections/keychron-open-source)
+- [P6 Ultra 8K User Manual](https://www.keychron.com/pages/keychron-p6-ultra-8k-user-manual)
+
+## License
+
+This project is **source-available**. Personal and educational use is allowed, and commercial use is allowed for original compatible accessories within the limits of the license.
+
+**You may not use these files to copy, manufacture, sell, or distribute Keychron keyboards or mice, or substantially similar products, and you may not use Keychron trademarks as your own branding.**
+
+See the [LICENSE](../../LICENSE) for full terms.