nix: Add om init template params

nix/modules/template.nix

@@ -1,8 +1,50 @@
 { inputs, ... }:
 
 {
-  flake.templates.default = {
-    description = "A batteries-included Rust project template for Nix";
-    path = builtins.path { path = inputs.self; };
+  flake = rec {
+    templates.default = {
+      description = "A batteries-included Rust project template for Nix";
+      path = builtins.path { path = inputs.self; };
+    };
+
+    # https://omnix.page/om/init.html#spec
+    om.templates.rust-nix-template = {
+      template = templates.default;
+      params = [
+        {
+          name = "package-name";
+          description = "Name of the Rust package";
+          placeholder = "rust-nix-template";
+        }
+        {
+          name = "author";
+          description = "Author name";
+          placeholder = "Sridhar Ratnakumar";
+        }
+        {
+          name = "author-email";
+          description = "Author email";
+          placeholder = "srid@srid.ca";
+        }
+        {
+          name = "vscode";
+          description = "Include the VSCode settings folder (./.vscode)";
+          paths = [ ".vscode" ];
+          value = true;
+        }
+        {
+          name = "github-ci";
+          description = "Include GitHub Actions workflow configuration";
+          paths = [ ".github" ];
+          value = true;
+        }
+        {
+          name = "nix-template";
+          description = "Keep the flake template in the project";
+          paths = [ "**/template.nix" ];
+          value = false;
+        }
+      ];
+    };
   };
 }