modified: README.md

modified:   docs/desktop-environments/kde.md
renamed:    docs/desktop-environments/xfc4.md -> docs/desktop-environments/xfce4.md
new file:   docs/display-managers/gdm.md
new file:   docs/display-managers/sddm.md
new file:   docs/display-protocols/wayland.md
new file:   docs/display-protocols/x11.md
new file:   docs/window-managers/hyprland.md
new file:   docs/window-managers/kwin.md

docs/desktop-environments/xfce4.md

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+# XFCE4
+
+Xfce4 is a lightweight, modular, and visually appealing desktop environment for Unix-like systems, designed for speed, low resource usage, and adherence to FreeDesktop standards. It’s ideal for older hardware, minimalist setups, and users who value performance over visual effects.
+
+**🧱 Core Components:**
+
+- Thunar: Fast, simple file manager with bulk renaming and custom actions
+- xfwm4: Window manager with compositing and theming
+- xfce4-panel: Customizable panel with plugin support
+- xfce4-settings: Centralized configuration tools
+- xfce4-terminal: Lightweight terminal emulator
+- Xfce Power Manager: Handles battery, brightness, and suspend settings
+
+**Installing with lightdm:**
+
+``` bash
+apt install xfce4 lightdm
+```