Updated README with instructions

README.md

@@ -1,3 +1,21 @@
-# nethack.nix
+# Nethack configuration module for home-manager
 
-Nethack configuration module in Nix, for use with home-manager
+TLDR: [home-manager](https://github.com/nix-community/home-manager/) module for easier `.nethackrc` configuration.
+
+## Usage
+
+1. Add this repo to inputs:
+```nix
+inputs.nethack.url = git+ssh://git@git.psf.lt/xezo360hye/nethack;
+```
+
+2. Use the input as module:
+```nix
+outpus.homeConfigurations."user@host" = home-manager.lib.homeManagerConfiguration {
+  modules = [
+    nethack.homeManagerModules.nethack
+
+    ./home.nix
+  ];
+};
+```