Update README

Author: lightcode

README.md

@@ -1,3 +1,54 @@
 # lc-shell for Nix
 
-This repository contains the Nix version of my Vim/ZSH/Tmux configuration called [lc-shell](https://github.com/lightcode/lc-shell).
+This repository contains the Nix version of my Vim/ZSH/Tmux configuration called [lc-shell](https://github.com/lightcode/lc-shell). This configuration is a module for [home-manager](https://github.com/nix-community/home-manager).
+
+
+## Usage
+
+### Include the module
+
+**Using niv** (you need to install and initialize it before):
+
+```shell
+niv add lightcode/lc-shell-nix -v v1.0.0
+```
+
+Then, you can import the module like this:
+
+```nix
+{
+  imports = let
+    sources = import ./nix/sources.nix {};
+  in [
+    sources.lc-shell-nix.outPath
+  ];
+
+  # ...
+}
+```
+
+**Or by fetching manually the tarball**:
+
+```nix
+{
+  imports = [
+    (fetchTarball "https://github.com/lightcode/lc-shell-nix/archive/v1.0.0.tar.gz")
+  ];
+}
+```
+
+### Enable the module
+
+In your home-manager configuration, you need to enable the features you need:
+
+```nix
+{
+
+  lc-shell = {
+    vim.enable = true;
+    tmux.enable = true;
+    zsh.enable = true;
+  };
+
+}
+```