Add README

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -0,0 +1,64 @@
+# Skwik
+
+Client-side image deskewing tool. Upload a photo taken at an angle, place reference measurements on known objects, and get a perspective-corrected output with real-world scale.
+
+Everything runs in the browser -- no server, no uploads.
+
+## How it works
+
+1. **Upload** a JPG or HEIC image (HEIC is converted automatically)
+2. **Review EXIF** data -- camera, lens, focal length
+3. **Place datums** on the image -- rectangles or lines with known real-world dimensions
+4. **Run correction** -- OpenCV.js computes a perspective transform and outputs a corrected image
+
+### The algorithm
+
+The highest-confidence rectangle datum defines the initial perspective correction via `getPerspectiveTransform`. All other datums (rectangles and lines) are projected through that transform and measured. Per-axis weighted scale corrections are computed from the discrepancies, folded back into the destination rectangle, and a single clean `warpPerspective` produces the output. One matrix, one warp, no post-hoc distortion.
+
+Datum confidence scores (1--5) act as weights in the correction.
+
+## Quick start
+
+```bash
+pnpm install
+pnpm dev
+```
+
+Open `http://localhost:5173`.
+
+## Build
+
+```bash
+pnpm build      # type-check + production build
+pnpm preview    # serve the build locally
+```
+
+## Lint & format
+
+```bash
+pnpm lint       # eslint (strict TS + Vue)
+pnpm lint:fix   # auto-fix
+pnpm format     # prettier
+pnpm type-check # vue-tsc
+```
+
+## Stack
+
+| Layer | Tech |
+|---|---|
+| Framework | Vue 3 + TypeScript (strict) |
+| Build | Vite |
+| Components | shadcn-vue + Tailwind CSS v4 |
+| Canvas | Konva.js + vue-konva |
+| CV | OpenCV.js 4.12 (WASM) |
+| HEIC | heic-to |
+| EXIF | exifr |
+| State | Pinia |
+
+## Datum presets
+
+Rectangles: A3, A4, A5, A6, 15x10 cm. Custom dimensions supported. Lines: any length.
+
+## License
+
+MIT