Updating the readme a bit

README.md

@@ -1,3 +1,19 @@
 # Simplify
 
-I'm going all in on home-manager. Wish me luck.
+I'm going all in on [Nix](https://nixos.org/) & [home-manager](https://github.com/rycee/home-manager). Wish me luck.
+
+## Nix home-manager files
+
+- **home-cli**: terminal-only settings
+- **home-gui**: cross-platform settings for Linux, Mac, & Windows
+- **home-mail**: eamil, contacts & calendar settings
+- **home-mac**: Mac-only settings
+- **home-linux**: Linux-only settigs
+
+## Systems
+
+I'm currently using Nix on:
+
+- my Samsung S9+ (via [nix-on-droid](https://github.com/t184256/nix-on-droid))
+- my Raspberry Pi 4 (running NixOS)
+- my work Macbook Pro