Added nix

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,3 +1,7 @@
 .build/
 .output/
-.DS_Store
+.DS_Store
+
+# nix
+.direnv/
+result

flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "muse dev shell";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      allSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+
+      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in
+    {
+      devShells = forAllSystems ({ pkgs }: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+            go
+            gopls
+            gotools
+            go-tools
+          ];
+
+          shellHook = ''
+            echo "<muse dev shell>"
+            echo "Go version: $(go version)"
+          '';
+        };
+      });
+    };
+}