add nix-on-droid configuration

profiles/mysticant/configuration.nix

@@ -0,0 +1,22 @@
+{ config, lib, pkgs, ... }:
+
+{
+  environment.packages = with pkgs; [
+    vim
+    git
+    man
+    gnupg
+  ];
+
+  # Backup etc files instead of failing to activate generation if a file already exists in /etc
+  environment.etcBackupExtension = ".bak";
+
+  # Read the changelog before changing this value
+  system.stateVersion = "23.05";
+
+  # Set up nix for flakes
+  nix.extraOptions = ''
+    experimental-features = nix-command flakes
+  '';
+
+}