Initialize flake.nix

flake.nix

@@ -0,0 +1,20 @@
+{
+  description = "A simple NixOS flake";
+
+  inputs = {
+    # NixOS official package source, using the nixos-23.11 branch here
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
+  };
+
+  outputs = { self, nixpkgs, ... }@inputs: {
+    # Please replace my-nixos with your hostname
+    nixosConfigurations.my-nixos = nixpkgs.lib.nixosSystem {
+      system = "x86_64-linux";
+      modules = [
+        # Import the previous configuration.nix we used,
+        # so the old configuration file still takes effect
+        ./configuration.nix
+      ];
+    };
+  };
+}