add: 'what is this' to readme

Author: Londopy

README.adoc

@@ -178,4 +178,78 @@ Right-click the tray icon → *Settings…* to open a tabbed window:
 * **Notifications** — master toggle and per-event checkboxes (update, hotkey
   fail, profile switch).
 * **Updater** — channel (stable/beta), check interval, manual check button.
-* **Discord**
+* **Discord** — enable/disable Rich Presence.
+* **About** — version, build target, links, "Copy debug info" button.
+
+---
+
+== Recovery
+
+=== Taskbar hidden and can't reach the tray
+
+Open *Run* (Win+R) and type:
+
+[source,powershell]
+----
+powershell -Command "Add-Type -N System.Windows.Forms; [System.Windows.Forms.SystemInformation]::PrimaryMonitorSize"
+----
+
+Or just press Ctrl+Alt+T — the hotkey works even without the taskbar visible.
+
+=== All windows hidden
+
+Press Ctrl+Alt+W again, or right-click the tray icon → *Toggle App Windows*.
+
+=== App not in tray after a crash
+
+Hidden windows stay hidden until the app restores them. Restarting
+HideDesktopApps will restore them automatically because the app checks state
+on startup. If that doesn't work, reboot — Windows restores all window
+visibility on logon.
+
+---
+
+== Building from source
+
+[source,bash]
+----
+# x64
+cargo build --release --target x86_64-pc-windows-msvc
+
+# ARM64 (cross-compiles from x64)
+cargo build --release --target aarch64-pc-windows-msvc
+----
+
+Requires the `windows-latest` GitHub Actions runner or a Windows machine with
+Visual Studio Build Tools + the relevant MSVC target installed.
+
+---
+
+== File layout
+
+----
+HideDesktopApps/
+├── src/                    Rust source
+│   ├── main.rs
+│   ├── config.rs
+│   ├── ui/                 egui settings window
+│   └── ...
+├── assets/
+│   └── installer.iss       Inno Setup script
+├── scoop/
+│   └── HideDesktopApps.json  Scoop manifest
+├── winget/
+│   └── manifests/          WinGet manifest tree
+├── .github/workflows/      CI (ci.yml) + release (release.yml)
+├── Cargo.toml
+├── LICENSE
+├── LICENSE-COMMERCIAL
+└── README.adoc             this file
+----
+
+---
+
+== License
+
+MIT for personal and open-source use. See link:LICENSE-COMMERCIAL[] for
+commercial licensing.