Add README.md with project documentation

README.md

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+# KissCut
+
+PySide6 GUI for generating smooth kiss-cut outlines from PNGs. Drop an image, tune a few sliders (inflation, smoothing, corner detection), preview the padded mask, and export a spline-smoothed SVG.
+
+## Features
+- Drag-and-drop PNG preview with auto-padding when the mask touches an edge.
+- Adjustable DPI, inflation (inches), alpha threshold, RDP epsilon, spline smoothing, spline points, and corner angle.
+- Mask overlay plus Bezier-path preview in the viewport.
+- SVG export of the smoothed outline (cubic Beziers).
+
+## Requirements
+- Python 3.9+ recommended.
+- Dependencies: `Pillow`, `numpy`, `scikit-image`, `scipy`, `PySide6`.
+
+Install deps:
+```bash
+pip install Pillow numpy scikit-image scipy PySide6
+```
+
+## Usage
+1) Run the app:
+```bash
+python kisscut_gui.py
+```
+2) Drag a PNG into the window (or drop a file and hit “Update Preview”).
+3) Tune sliders/inputs:
+   - `DPI`: used for inflation and mm conversion.
+   - `Inflation (inch)`: outward growth of the mask.
+   - `Alpha Threshold`: what counts as transparent vs opaque.
+   - `RDP Epsilon (mm)`, `Spline Smoothing`, `Spline Points`, `Corner Angle`: simplification and curve-fit controls.
+4) Click “Export Vector” to save an SVG with the fitted outline.
+
+## Samples
+Try the images in `samples/` to see expected behavior.
+
+## License
+CC0-1.0 Public Domain Dedication. Use, modify, and redistribute freely.