Add flake.nix

flake.nix

@@ -0,0 +1,24 @@
+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs {
+        inherit system;
+        config.allowUnfree = true;
+      };
+      lib = nixpkgs.lib;
+    in {
+      nixosConfigurations = {
+        nixos-desktop = lib.nixosSystem {
+          inherit system;
+          modules = [ ./configuration.nix ];
+        };
+      };
+    };
+}