Add nix dev files

flake.nix

@@ -0,0 +1,21 @@
+{
+  description = "my project description";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    fenix.url = "github:nix-community/fenix";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, fenix }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ fenix.overlays.default ];
+        };
+      in
+      {
+        devShells.default = import ./shell.nix { inherit pkgs; };
+      }
+    );
+}

shell.nix

@@ -0,0 +1,13 @@
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    # nativeBuildInputs is usually what you want -- tools you need to run
+    nativeBuildInputs = with pkgs.buildPackages; [
+          (fenix.stable.withComponents [
+            "cargo"
+            "clippy"
+            "rust-src"
+            "rustc"
+            "rustfmt"
+          ])
+    ];
+}