add shell and flake for nix-shell or nix develop for Rust

dev/rust/flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1739446958,
+        "narHash": "sha256-+/bYK3DbPxMIvSL4zArkMX0LQvS7rzBKXnDXLfKyRVc=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "2ff53fe64443980e139eaa286017f53f88336dd0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

dev/rust/flake.nix

@@ -0,0 +1,21 @@
+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+  let
+    pkgs = nixpkgs.legacyPackages."x86_64-linux";
+  in
+  {
+
+    devShells."x86_64-linux".default = pkgs.mkShell {
+      packages = with pkgs; [ cargo rustc ];
+    };
+
+    RUST_BACKTRACE = 1;
+
+  };
+}

dev/rust/shell.nix

@@ -0,0 +1,13 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+  pkgs.mkShell {
+    packages = with pkgs; [ cargo rustc ];
+
+    #inputsFrom = with pkgs; [ bat ];
+    
+    RUST_BACKTRACE = 1;
+
+    shellHook = ''
+       echo "Ready to make some rust!"
+    '';
+}