nix: add sample node configuration
diff --git a/nix/configuration.sample.nix b/nix/configuration.sample.nix
new file mode 100644
index 0000000..8681f76
--- /dev/null
+++ b/nix/configuration.sample.nix
@@ -0,0 +1,11 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./hswaw-cluster.nix
+  ];
+
+  networking.hostName = "bc01n01";
+  system.stateVersion = "18.09";
+}