docs: improve README.md

README.md

@@ -5,6 +5,16 @@
 
 This is my NixOS and Home Manager configuration, which I use on my personal computer. NixOS is a Linux distribution that uses the Nix package manager, and Home Manager is a Nix-based configuration management tool for configuring the user environment. This configuration uses the new Flakes feature in Nix to provide a more modular and flexible way of managing the configuration.
 
+## Layout
+
+This project uses Nix Flakes to manage the configurations. You can read more about Flakes [here](https://wiki.nixos.org/wiki/Flakes).
+
+The Flake has outputs for my Hosts (as NixOS or Nix Darwin) configurations and my Home Manager configurations. The `hosts` directory contains the NixOS and Nix Darwin configurations, and the `home` directory contains the Home Manager configurations.
+
+For reproducibility, I'm using modules defined in the `modules` directory for my hosts and `home/modules` for my Home Manager configuration.
+
+To automatically inject the modules into the configuration, I'm using custom functions defined in `lib`.
+
 ## CI
 
 ### Garnix