windows-alttab@samuel-ifrs: add new extension

windows-alttab@samuel-ifrs/README.md

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+# Windows Alt+Tab
+
+An Alt+Tab window switcher for Cinnamon that shows **live window thumbnails (previews)**, in the classic Windows style.
+
+## Features
+
+- **Live thumbnails** of every window while you hold <kbd>Alt</kbd> and press <kbd>Tab</kbd>.
+- Each entry shows the application icon and the window title.
+- Items wrap into multiple rows when there are many windows, centered on the active monitor.
+- Minimized windows are dimmed so you can tell them apart.
+- **Middle-click** a thumbnail to close that window without leaving the switcher.
+- **Right-click** a thumbnail to open the standard window menu (minimize, maximize, move, close, ...).
+
+## Usage
+
+Enable the extension in **System Settings → Extensions**. From then on, <kbd>Alt</kbd>+<kbd>Tab</kbd> uses the thumbnail switcher.
+
+While the extension is enabled it sets the Cinnamon `alttab-switcher-style` to `windows`. When you disable it, the previous switcher style is restored automatically.
+
+## Notes
+
+This extension provides only the Alt+Tab switcher. It does not change any other part of the desktop.