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/display-managers/gdm.md

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+# GDM - GNOME Display Manager
+
+GDM (GNOME Display Manager) is the default graphical login manager for the GNOME desktop environment. It provides the login screen, manages user sessions, and supports both X11 and Wayland.
+
+**🧩 Key Features of GDM:**
+
+- **Graphical login interface:** Presents a polished, user-friendly login screen.
+- **Session management:** Lets users choose between desktop environments and session types (e.g., GNOME on X11 or Wayland).
+- **Accessibility:** Offers built-in support for screen readers and other assistive technologies.
+- **Security:** Runs the login screen as a separate user (gdm), isolating it from user sessions.
+
+**🛠️ Technical Details:**
+
+- Written in C and maintained by the GNOME Project.
+- Supports Wayland and X11, automatically launching the appropriate session.
+- Highly integrated with GNOME, but can also be used with other desktop environments.
+
+**🧭 Usage and Configuration:**
+
+Default in Ubuntu, Fedora, and other GNOME-based distributions.
+Configurable via /etc/gdm/custom.conf for settings like autologin, Wayland enablement, and session defaults.