Init with backend

flake.nix

@@ -0,0 +1,35 @@
+{
+  description = "Blackjack Rust backend";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      forAllSystems =
+        function:
+        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
+          system: function (
+            import nixpkgs {
+              inherit system;
+            }
+          )
+        );
+    in
+    {
+      devShells = forAllSystems (pkgs: {
+        default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            rustc
+            cargo
+            rust-analyzer
+            rustfmt
+            clippy
+          ];
+
+          RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+        };
+      });
+    };
+}