docs(readme): add usage instructions

1 files changed, 30 insertions, 0 deletions

diff --git a/README.md b/README.md
index ddfa2fa..54bff42 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,36 @@ directory.
 Rui looks at the `FLAKE_EDITOR` environment variable for the editor to use when
 opening the flake directory, but falls back to `EDITOR` if it isn't set.
 
+## Installation
+
+### Add to Flake Inputs
+
+```nix
+{
+  inputs.rui = {
+    url = "github:Fuwn/rui";
+    inputs.nixpkgs.follows = "nixpkgs"; # Recommended
+  };
+}
+```
+
+### Add to System or Home Manager Packages
+
+```nix
+rui.packages.${pkgs.system}.default
+
+# or
+
+(import (
+  pkgs.fetchFromGitHub {
+    owner = "Fuwn";
+    repo = "rui";
+    rev = "...";  # Use the current commit revision hash
+    hash = "..."; # Use the current commit sha256 hash
+  }
+)).packages.${builtins.currentSystem}.default
+```
+
 ## `--help`
 
 ```text