Create visual guide for VaultOS with screenshots

Added a visual guide with screenshots and descriptions for the VaultOS dashboard and container creation wizard.

Author: mddanish

screenshots/screenshot.md

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+# VaultOS Screenshots & Visual Guide
+
+## Dashboard Views
+
+### Main Dashboard (`TUI1.png`, `TUI2.png`)
+The primary interface of VaultOS. 
+- **Grid Layout**: Shows a responsive table of active containers.
+- **Columns**: Displays Container ID, Name, Status, OS Distribution, Desktop Environment, Host Port, and Expiration Timer.
+- **Status Bar**: Provides real-time feedback on Docker connection status (`🟢 Connected`), Engine API version, and a summary of Total/Running/Stopped containers.
+- **Toolbar**: Quick access buttons for creation and lifecycle management (`Create`, `Start`, `Stop`, `Delete`, `Refresh`).
+
+---
+
+## Container Creation Wizard
+
+### Step 1: Mode Selection
+
+#### Default Mode (`Default.png`)
+The standard, quick-start configuration.
+- **Name**: User defines a simple identifier (e.g., `dev-box`).
+- **Port**: Maps to a local host port (default `3001`).
+- **Mode Selected**: `Default` is chosen for a standardized, ephemeral Alpine/XFCE container.
+
+#### Persistant Mode (`Persistant1.png`)
+For environments that require data retention.
+- **Mode Selected**: `Persistent`.
+- **Volume Path**: A host path is provided (e.g., `C:/data/config`) to ensure `/config` data survives container restarts.
+- **Advanced Options**: The checkbox "Enable Advanced Options" is visible, allowing further customization in Step 3.
+
+#### Ephemeral Mode (`Epheremal1.png`)
+For temporary, disposable workspaces.
+- **Mode Selected**: `Ephemeral`.
+- **Timer Input**: A timer field appears (e.g., `30s`, `2h`) to set the lifespan of the container.
+
+### Step 2: Distribution & Desktop (`Epheremal2.png`, `Persistant2.png`)
+Selecting the environment flavor.
+- **OS Distribution**: A dropdown allows selection of base Linux distros (Alpine, Ubuntu, Arch, Fedora, etc.).
+- **Desktop Environment**: Context-aware dropdown to choose the desktop interface (XFCE, KDE, MATE, i3).
+
+### Step 3: Advanced Configuration (`Persistant3.png`)
+Only available in Persistent mode with "Advanced Options" checked.
+- **Custom User**: Allows replacing the default `abc` user with a custom username (e.g., `danish`).
+- **Home Mapping**: Maps a host directory to the custom user's home (e.g., `/data/home` -> `/home/danish`), ensuring full user persistence and correct permissions.