added nix flake

.gitignore

@@ -1 +1,2 @@
 /target
+/result

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1792773339,
+        "narHash": "sha256-rZLrzrC6i+jnTAlvPZHogKDulY7WWDEv9hJeHieO7Zw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3ec636362e1816bc2f0888fa0fa2c69f1bc9e504",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,22 @@
+{
+  description = "rusty-pw: random word + number generator";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+      systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" ];
+      forAllSystems = f:
+        nixpkgs.lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
+    in
+    {
+      packages = forAllSystems (pkgs: rec {
+        rusty-pw = pkgs.callPackage ./package.nix { };
+        default = rusty-pw;
+      });
+
+      overlays.default = final: prev: {
+        rusty-pw = final.callPackage ./package.nix { };
+      };
+    };
+}

package.nix

@@ -0,0 +1,14 @@
+{ lib, rustPlatform }:
+
+rustPlatform.buildRustPackage {
+  pname = "rusty-pw";
+  version = (lib.importTOML ./Cargo.toml).package.version;
+
+  src = lib.cleanSource ./.;
+  cargoLock.lockFile = ./Cargo.lock;
+
+  meta = {
+    description = "Random word + number generator";
+    mainProgram = "rusty-pw";
+  };
+}