adding default.nix for nix packaging

default.nix

@@ -0,0 +1,48 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, meson
+, ninja
+, pkg-config
+, wrapGAppsHook4
+, gtk4
+, gtkmm4
+, libsigcxx
+}:
+
+stdenv.mkDerivation rec {
+  pname = "minesweeper";
+  version = "0.2.0";
+
+  src = ./.;
+  
+  # If you want to use fetchFromGitHub instead:
+  # src = fetchFromGitHub {
+  #   owner = "username";
+  #   repo = "minesweeper";
+  #   rev = "v${version}";
+  #   hash = "sha256-0000000000000000000000000000000000000000000=";
+  # };
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+    wrapGAppsHook4
+  ];
+
+  buildInputs = [
+    gtk4
+    gtkmm4
+    libsigcxx
+  ];
+
+  meta = with lib; {
+    description = "Modern Minesweeper game with GTK4 interface";
+    homepage = "https://github.com/username/minesweeper";
+    license = licenses.mit;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ /* your name here */ ];
+    mainProgram = "minesweeper";
+  };
+}

flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1735563628,
+        "narHash": "sha256-OnSAY7XDSx7CtDoqNh8jwVwh4xNL/2HaJxGjryLWzX8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b134951a4c9f3c995fd7be05f3243f8ecd65d798",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

shell.nix

@@ -1,24 +0,0 @@
-{ pkgs ? import <nixpkgs> {} }:
-
-pkgs.mkShell {
-  buildInputs = with pkgs; [
-    meson
-    ninja
-    pkg-config
-    gtk4
-    gtkmm4
-    libsigcxx
-    
-    # Development tools
-    gdb
-    valgrind
-    clang-tools
-  ];
-
-  shellHook = ''
-    echo "MineSweeper Development Environment"
-    echo "=================================="
-    echo "Build with: meson setup build && meson compile -C build"
-    echo "Run with: ./build/minesweeper"
-  '';
-}