Add flake

Author: escherlies

flake.nix

@@ -0,0 +1,52 @@
+{
+  description = "NixCon 2025";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+  };
+
+  outputs =
+    { self, ... }@inputs:
+    with inputs;
+    let
+      # System types to support.
+      supportedSystems = [
+        "x86_64-linux"
+        "x86_64-darwin"
+        "aarch64-linux"
+        "aarch64-darwin"
+      ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+
+    in
+    {
+      nixosConfigurations = { };
+
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [
+              just
+              nodejs_20
+
+            ];
+
+            shellHook = ''
+              echo "To get startet run `just dev`"
+            '';
+          };
+        }
+      );
+
+    };
+}