Add initial Bitpoll Nix flake and example configuration

example-configuration.nix

@@ -0,0 +1,53 @@
+# Example NixOS configuration using the Bitpoll flake
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    # Include your hardware configuration
+    ./hardware-configuration.nix
+  ];
+
+  # Enable flakes
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # Basic system configuration
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  networking.hostName = "bitpoll-server";
+  networking.firewall.allowedTCPPorts = [ 8080 22 ];
+
+  # Enable SSH for remote management
+  services.openssh.enable = true;
+
+  # Bitpoll service configuration
+  services.bitpoll = {
+    enable = true;
+    port = 8080;
+    host = "0.0.0.0";  # Listen on all interfaces
+    allowedHosts = [ 
+      "bitpoll.example.com" 
+      "localhost" 
+      "127.0.0.1"
+    ];
+    
+    # Optional: Use a secret key file for better security
+    # secretKeyFile = "/etc/bitpoll/secret-key";
+  };
+
+  # Create a user for administration
+  users.users.admin = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ]; # Enable 'sudo' for the admin user
+    openssh.authorizedKeys.keys = [
+      # Add your SSH public key here
+      # "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC..."
+    ];
+  };
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It's perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  system.stateVersion = "25.05";
+}