added nix files

.nix/derivation.nix

@@ -0,0 +1,32 @@
+{ lib
+, stdenvNoCC
+, zlib
+, fetchFromGitHub
+, scons
+, pkg-config
+, clang_12
+, clang-tools
+, gnutls
+, keldu
+}:
+
+stdenvNoCC.mkDerivation {
+  pname = "forstio-window";
+  version = "0.0.0";
+
+  nativeBuildInputs = [
+    scons
+    clang_12
+    clang-tools
+  ];
+
+  buildInputs = [
+    keldu.forstio
+  ];
+
+  src = ./..;
+
+  enableParallelBuilding = true;
+
+  outputs = ["out" "dev"];
+}

.nix/release.nix

@@ -0,0 +1,9 @@
+{ ... }:
+let
+  pkgs = (import <nixpkgs>{});
+in
+{
+  keldu = {
+    forstio-window = pkgs.callPackage ./derivation.nix {};
+  };
+}

default.nix

@@ -0,0 +1,3 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.callPackage ./.nix/derivation.nix {}