nix(module): module boilerplate

flake.nix

@@ -35,5 +35,27 @@
             graphviz
           ];
         };
+
+        nixosModules.default = {
+          config,
+          lib,
+          ...
+        }: let
+          # Shorter name to access final settings a
+          # user of hello.nix module HAS ACTUALLY SET.
+          # cfg is a typical convention.
+          cfg = config.services.tildefriends;
+        in {
+          options.services.tildefriends = {
+            enable = lib.mkEnableOption "Enable Tilde Friends";
+          };
+
+          config = lib.mkIf cfg.enable {
+            systemd.services.tildefriends = {
+              wantedBy = ["multi-user.target"];
+              serviceConfig.ExecStart = "${pkgs.tildefriends}/bin/tildefriends";
+            };
+          };
+        };
       });
 }