Add new file

config.nix

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+{ config, pkgs, ... }: 
+
+{
+    # Import other configuration modules
+    # (hardware-configuration.nix is autogenerated upon installation)
+    # paths in nix expressions are always relative the file which defines them
+    imports =
+        [
+            ./hardware-configuration.nix
+            ./my-dev-tools.nix
+            ./my-desktop-env.nix
+            ./etc.nix
+        ];
+
+    # Name your host machine
+    networking.hostName = "NixOS-VM"; 
+
+    # Set your time zone.
+    time.timeZone = "America/Denver";
+
+    # Enter keyboard layout
+    services.xserver.layout = "us";
+
+    # Define user accounts
+    users.extraUsers = 
+        { 
+            myuser = 
+            {
+                extraGroups = [ "wheel" "networkmanager" ];
+                isNormalUser = true;
+            };
+        };
+    
+    # Install some packages
+    environment.systemPackages = 
+            with pkgs; 
+            [
+                ddate
+                testdisk
+                zsh
+            ]; 
+ 
+    # Enable the OpenSSH daemon
+    services.openssh.enable = true;
+    
+}