Add project documentation and installer layout

docs/02-xfce.md

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+# XFCE
+
+## Installierte Pakete
+
+- xorg
+- xfce4
+- xfce4-terminal
+- lightdm
+- network-manager
+- gvfs
+- file-roller
+- Papirus Icons
+- Arc Theme
+
+## Besonderheiten
+
+- Dark Theme
+- Papirus Dark
+- JetBrainsMono Nerd Font
+- Datacenter Wallpaper
+
+## Status
+
+Fertig