added a template file i can copy

modules/empty.nix

@@ -0,0 +1,24 @@
+{
+  self,
+  inputs,
+  ...
+}: {
+  flake.nixosModules.name = {
+    pkgs,
+    lib,
+    ...
+  }: {
+    programs.name = {
+      enable = true;
+      package = self.packages.${pkgs.stdenv.hostPlatform.system}.hello;
+    };
+  };
+  perSystem = {
+    pkgs,
+    lib,
+    self',
+    ...
+  }: {
+    packages.hello = pkgs.hello;
+  };
+}