docs(example): add example configuration

added both a home-manager and 'minimal configuration'.
They can be built and testet in this repo via:
- nixos-generate-config --dir example/default # or example/home-manager
- nix build path:./example/default#nixosConfigurations.default.config.system.build.toplevel # or path:./example/home-manager#...

the flake.lock and hardeware-configuration is ignored to prevent accidental commitment of the hardware-configuration (and get the freshes packages when somebody might use these configs as templates

example/default/configuration.nix

@@ -0,0 +1,63 @@
+{ pkgs, ... }: {
+
+  system.stateVersion = "25.05";
+  nix.settings.experimental-features = [
+    "flakes" "nix-command" "pipe-operators"
+  ];
+  
+  nixos95 = {
+    enable = true;
+    user = "alice";
+
+    taskbar = {
+      homeIcon = "whisker-menu-button";
+      battery-plugin.enable = false;
+      applications = [
+        {
+          name = "Files";
+          description = "View and manage local files";
+          icon = "folder_open";
+          exe = "exo-open --launch FileManager";
+        }
+        {
+          name = "Firefox";
+          description = "Browse the Web";
+          pkg = pkgs.firefox;
+          icon = "world";
+        }
+        {
+          name = "Signal";
+          description = "Private Messenger";
+          pkg = pkgs.signal-desktop;
+          icon = "signal";
+        }
+      ];
+    };
+
+    keybinds = {
+      commands = [
+        { key="<Super>l";  exe="xflock4"; }
+      ];
+    };
+  };
+
+  users.users.alice = {
+    isNormalUser = true;
+    initialPassword = "password";
+    home = "/home/alice";
+    createHome = true;
+
+    packages = [
+      pkgs.firefox
+      pkgs.neovim
+      pkgs.signal-desktop
+    ];
+  };
+
+  networking.hostName = "nixos95";
+  networking.networkmanager.enable = true;
+
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+}