added flakes

flake.nix

@@ -0,0 +1,26 @@
+{
+  description = "Go Orange";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        default = pkgs.buildGoModule {
+          pname = "go-orange";
+          version = "0.0.1";
+          src = ./.;
+          vendorHash = null;
+        };
+      in {
+        packages = { default = default; };
+        devShell = pkgs.mkShell {
+          name = "Go-Orange";
+          buildInputs = with pkgs; [ go ];
+        };
+      });
+
+}