feat: init desktop app

apps/desktop/README.md

@@ -0,0 +1,47 @@
+# Desktop
+
+The native desktop app, built with [GPUI](https://gpui.rs).
+
+## Getting started
+
+**1. Install Rust:**
+
+```bash
+# Linux / macOS / WSL
+./script/setup-rust
+```
+
+```powershell
+# Windows
+powershell -ExecutionPolicy Bypass -File .\script\setup-rust.ps1
+```
+
+Both scripts skip installation if Rust is already present. On Linux/macOS/WSL only: after a fresh install, reload your shell with `source "$HOME/.cargo/env"`
+
+**2. Install native dependencies:**
+
+```bash
+# Linux / macOS / WSL
+./apps/desktop/script/setup
+```
+
+```powershell
+# Windows
+powershell -ExecutionPolicy Bypass -File .\apps\desktop\script\setup.ps1
+```
+
+**3. Run:**
+
+```bash
+cargo run -p opencut-desktop
+```
+
+## Platform notes
+
+**Linux:** supports apt (Debian/Ubuntu/Mint), dnf (Fedora/RHEL), and pacman (Arch).
+
+**macOS:** installs Xcode Command Line Tools if missing.
+
+**Windows:** the setup script checks for Visual Studio Build Tools. If missing, it prints the install link.
+
+**WSL:** runs the same scripts as Linux. Window rendering works via WSLg on Windows 11 and Windows 10 22H2+. If you're on an older build, test on the host instead.