feat: add comprehensive NixOS configuration documentation and structure

- Introduced `08-structure.md` detailing project structure, main files, and versioning.
- Created `README.md` for documentation overview and quick start guide.
- Added user-specific configurations for Alacritty, Vim, Micro, Git, Zsh, Tmux, and tools.
- Implemented system modules for desktop environment (KDE Plasma), audio (PipeWire), networking, and services (OpenSSH, GnuPG).
- Configured Nix settings with flakes support and garbage collection.
- Established user management for `ada` with necessary groups and shell settings.
- Enabled VirtualBox guest additions for improved VM experience.

nixos/modules/desktop/pipewire.nix

@@ -0,0 +1,18 @@
+{ ... }:
+
+{
+  # Отключение PulseAudio
+  services.pulseaudio.enable = false;
+
+  # Включение RealtimeKit для низколатентного аудио
+  security.rtkit.enable = true;
+
+  # Включение PipeWire
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    # jack.enable = true;  # Раскомментируйте для поддержки JACK
+  };
+}

nixos/modules/desktop/plasma.nix

@@ -0,0 +1,43 @@
+{ pkgs, ... }:
+
+{
+  # Включение X11 и Wayland
+  services.xserver.enable = true;
+
+  # Окружение рабочего стола KDE Plasma 6
+  services.displayManager.sddm = {
+    enable = true;
+    wayland.enable = true;
+  };
+
+  services.desktopManager.plasma6.enable = true;
+
+  # Настройка раскладки клавиатуры
+  services.xserver.xkb = {
+    layout = "us,ru";  # Английская и русская раскладки
+    variant = "";
+    options = "grp:caps_toggle";  # Переключение раскладки по Caps Lock
+  };
+
+  # Поддержка Wayland для Electron приложений
+  environment.sessionVariables.NIXOS_OZONE_WL = "1";
+
+  # Включение CUPS для печати
+  services.printing.enable = true;
+
+  # Дополнительные пакеты KDE/Qt
+  environment.systemPackages = with pkgs; [
+    kdePackages.plasma-browser-integration
+    kdePackages.kio-extras
+    kdePackages.kio-fuse
+    kdePackages.kate
+    kdePackages.kcalc
+    kdePackages.kcharselect
+    kdePackages.filelight
+    kdePackages.partitionmanager
+    kdePackages.ark
+    kdePackages.okular
+    kdePackages.gwenview
+    kdePackages.spectacle
+  ];
+}