fix(nix-monitor): change readme

nix-monitor/README.md

@@ -1,5 +1,17 @@
 # Nix Monitor
 
-![thumbnail](thumbnail.webp)
+![Nix Monitor thumbnail](thumbnail.webp)
 
-**Nix Monitor** checks Nixpkgs update by comparing local nix hash and remote Nixpkgs's hash. It also can run update and clean command.
+**Nix Monitor** checks Nixpkgs update by comparing local nix hash and remote Nixpkgs's hash
+
+## Features
+ - Shows local and remote nixpkgs hash
+ - Shows NixOS and optionally Home Manager generations
+ - Shows Nix Store size and closure size
+ - Customizable clean and update command
+
+ ## Requirements
+  - Git
+  - NixOS commands (`nix`, `nixos-rebuild`, `nixos-version`)
+  - Linux tools (`du`, `cat`, `awk`, `grep`, `tail`, `wc`, `pkill`)
+  - Optionally `home-manager`