added zsh.nix file

homeManagerModules/zsh.nix

@@ -0,0 +1,16 @@
+{config, pkgs, ...}:  {
+	programs.zsh = {
+  		enable = true;
+		enableSyntaxHighlighting = true;
+		loginExtra = "sway --unsupported-gpu";
+		shellAliases = {
+			"update" = "sudo nixos-rebuild switch --flake /home/rohand/nixos-surface-config#xps";
+		};
+		oh-my-zsh = {
+			enable = true;
+			plugins = ["git" "vi-mode"];
+			theme = "afowler";
+		};
+  };
+
+}