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README.md

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+# KM Plot
+
+Inkscape extension for Knox Makers to drive HPGL based vinyl/plotter devices over serial. Largely based on the built-in Export > Plot extension for Inkscape but with a GTK interface and Serial Port detection.
+
+## Manual Installation
+
+1) Copy the files into your Inkscape extensions directory:
+   - Linux: `~/.config/inkscape/extensions/`
+     - Flatpak: `~/.var/app/org.inkscape.Inkscape/config/inkscape/extensions/`
+     - Snap: `~/snap/inkscape/current/.config/inkscape/extensions/`
+   - macOS (Inkscape app bundle): `~/Library/Application Support/org.inkscape.Inkscape/config/inkscape/extensions/`
+   - Windows: `%APPDATA%\Inkscape\extensions\`
+
+2) Restart Inkscape, then find the extension under **Extensions -> Knox Makers -> KM Plot**.
+
+3) Connect your plotter via USB/serial; select the detected port in the Device tab, adjust settings as needed, and click **Send to plotter**.