Add zsh flake

flake.nix

@@ -0,0 +1,27 @@
+{
+  description = "My zsh dot files in flake format";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    forEachSystem = fn:
+      nixpkgs.lib.genAttrs
+      ["x86_64-linux" "aarch64-linux"]
+      (system: fn system nixpkgs.legacyPackages.${system});
+  in {
+    # Define a package for your project
+    packages = forEachSystem (system: pkgs: rec {
+      zsh = import ./nix/wrapZsh.nix {
+        inherit pkgs;
+        lib = nixpkgs.lib;
+      };
+
+      default = zsh;
+    });
+  };
+}