Update README.md

Author: lukasl-dev

README.md

@@ -1 +1,39 @@
 # nixos
+
+![Preview](./docs/preview.png)
+
+## Synopsis
+
+```
+.
+├── docs
+│   └── documentation-related files, e.g. screenshots, ...
+├── dots
+│   └── dotfiles, e.g. neovim, ghostty, ...
+├── home
+│   ├── desktop
+│   │   └── home-manager config for desktop hosts
+│   ├── headless
+│   │   └── home-manager config for non-desktop hosts, e.g. servers
+│   └── shared config for both desktop and headless hosts
+├── hosts
+│   ├── desktops
+│   │   ├── orion
+│   │   │   └── nixos config for the orion desktop host
+│   │   ├── vega
+│   │   │   └── nixos config for the vega desktop host
+│   │   └── shared config for all desktop hosts
+│   ├── servers
+│   │   ├── sirius
+│   │   │   └── nixos config for the sirius server host
+│   │   └── shared config for all server hosts
+│   └── shared config for both desktops servers
+├── modules
+│   └── nixos modules for various services and apps
+├── scripts
+│   └── useful scripts
+├── secrets
+│   └── sops secret files
+├── wallpapers
+│   └── wallpapers used by desktop hosts
+```