Added Nix Flake

flake.nix

@@ -0,0 +1,23 @@
+{
+  description = "Rust setup";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+    in {
+      devShells.${system}.default = pkgs.mkShell {
+
+        buildInputs = with pkgs; [
+          cargo
+          clippy
+          rustfmt
+        ];
+
+      };
+    };
+}