add flake

flake.nix

@@ -0,0 +1,34 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+  };
+
+  outputs = {
+    self,
+    flake-parts,
+    ...
+  } @ inputs:
+    flake-parts.lib.mkFlake {inherit inputs;} {
+      systems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
+
+      perSystem = {
+        lib,
+        pkgs,
+        self',
+        ...
+      }: {
+        devShells.default = with pkgs;
+          mkShell {
+            packages = [clippy rustfmt rust-analyzer redis xh];
+            RUST_SRC_PATH = "${pkgs.rustPlatform.rustLibSrc}";
+          };
+
+        formatter = pkgs.alejandra;
+      };
+    };
+}