Add documentation for PKGBUILD.kwin

Co-authored-by: wheaney <42350981+wheaney@users.noreply.github.com>

PKGBUILD.kwin.README.md

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+# Breezy Desktop KWin Plugin - AUR PKGBUILD
+
+This directory contains the PKGBUILD file for creating an Arch Linux AUR package for the Breezy Desktop KWin plugin.
+
+## File
+
+- `PKGBUILD.kwin` - AUR PKGBUILD for breezy-desktop-kwin-git
+
+## About
+
+The `breezy-desktop-kwin-git` package provides the KWin plugin for Breezy Desktop, which enables virtual desktop environments for gaming and productivity on KDE Plasma 6 using [supported XR glasses](https://github.com/wheaney/XRLinuxDriver#supported-devices).
+
+## Installation via AUR
+
+Once this PKGBUILD is published to AUR, Arch Linux users can install Breezy Desktop for KWin with:
+
+```bash
+yay -S breezy-desktop-kwin-git
+```
+
+or using other AUR helpers like `paru`.
+
+After installation:
+
+1. Log out and back in
+2. Enable "Breezy Desktop" from the Desktop Effects in System Settings
+3. Launch the Breezy Desktop application to configure settings
+
+## Dependencies
+
+The package requires:
+- KDE Plasma 6 (KWin) with Wayland support
+- Qt6 (base and declarative modules)
+- KDE Frameworks 6 (config, configwidgets, coreaddons, globalaccel, i18n, kcmutils, windowsystem, xmlgui)
+- Python 3
+- libepoxy and libxcb
+
+## Optional Dependencies
+
+- `xr-driver-breezy-kwin-git` - XR driver backend (recommended for full functionality)
+
+## Manual Build
+
+To build the package manually without publishing to AUR:
+
+1. Copy `PKGBUILD.kwin` to a clean build directory
+2. Rename it to `PKGBUILD`
+3. Run `makepkg -si` to build and install
+
+## Publishing to AUR
+
+To publish or update this package on AUR:
+
+1. Create or clone the AUR repository for `breezy-desktop-kwin-git`
+2. Copy the contents of `PKGBUILD.kwin` to `PKGBUILD` in the AUR repo
+3. Update `.SRCINFO` by running: `makepkg --printsrcinfo > .SRCINFO`
+4. Commit and push to AUR
+
+## Notes
+
+- This package builds from the latest git source
+- The version is automatically derived from the VERSION file in the repository
+- The package installs to system directories (/usr) following Arch Linux packaging standards
+- Users must be on Wayland to use virtual display features
+- For X11 users, only physical display features will work
+
+## See Also
+
+- Main repository: https://github.com/wheaney/breezy-desktop
+- GNOME variant: [breezy-desktop-gnome-git](https://aur.archlinux.org/packages/breezy-desktop-gnome-git) (already available in AUR)
+- XR Driver: [xr-driver-breezy-gnome-git](https://aur.archlinux.org/packages/xr-driver-breezy-gnome-git) (for GNOME; KWin variant may vary)
+