add flake template

flake.nix

@@ -296,5 +296,12 @@
           };
         };
       }));
+
+    templates = {
+      simple = {
+        description = "Simple dream2nix flake";
+        path = ./simple;
+      };
+    };
   };
 }

templates/simple/flake.nix

@@ -0,0 +1,16 @@
+{
+  inputs.dream2nix.url = "github:nix-community/dream2nix";
+  outputs = {
+    self,
+    dream2nix,
+  } @ inputs: let
+    dream2nix = inputs.dream2nix.lib.init {
+      # modify according to your supported systems
+      systems = ["x86_64-linux"];
+      config.projectRoot = ./.;
+    };
+  in
+    dream2nix.makeFlakeOutputs {
+      source = ./.;
+    };
+}