feat: added nix direnv (#22)

.envrc

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

.gitignore

@@ -134,3 +134,6 @@ dist
 .yarn/build-state.yml
 .yarn/install-state.gz
 .pnp.*
+
+# nix
+.direnv/

flake.nix

@@ -0,0 +1,34 @@
+{
+  description = "A Nix-flake-based Node.js development environment";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11"; # latest stable version at this time
+
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit system; overlays = [ self.overlays.default ]; };
+      });
+    in
+    {
+      overlays.default = final: prev: rec {
+        nodejs = prev.nodejs;
+      };
+
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+          node2nix
+          nodejs
+          pre-commit
+          ];
+
+          shellHook = ''
+            npm ci
+            export PATH=$PATH:$PWD/bin
+          '';
+          TEST="Hello Cloud Native Austria Contributor! :D";
+        };
+      });
+    };
+}