feat: add theme and dark-mode arguments in readme file.

Author: MeshkatShB

README.md

@@ -61,6 +61,44 @@ playwright install
     - Open the WebUI in a non-Chrome browser, such as Firefox or Edge. This is important because the persistent browser context will use the Chrome data when running the agent.
     - Check the "Use Own Browser" option within the Browser Settings.
 
+### Options:
+
+### `--theme`
+
+- **Type**: `str`
+- **Default**: `Ocean`
+- **Description**: Specifies the theme for the user interface.
+- **Options**:
+  The available themes are defined in the `theme_map` dictionary. Below are the options you can choose from:
+  - **Default**: The standard theme with a balanced design.
+  - **Soft**: A gentle, muted color scheme for a relaxed viewing experience.
+  - **Monochrome**: A grayscale theme with minimal color for simplicity and focus.
+  - **Glass**: A sleek, semi-transparent design for a modern appearance.
+  - **Origin**: A classic, retro-inspired theme for a nostalgic feel.
+  - **Citrus**: A vibrant, citrus-inspired palette with bright and fresh colors.
+  - **Ocean** (default): A blue, ocean-inspired theme providing a calming effect.
+
+**Example**:
+
+```bash
+python webui.py --ip 127.0.0.1 --port 7788 --theme Glass
+```
+
+### `--dark-mode`
+
+- **Type**: `boolean`
+- **Default**: Disabled
+- **Description**: Enables dark mode for the user interface. This is a simple toggle; including the flag activates dark mode, while omitting it keeps the interface in light mode.
+- **Options**:
+  - **Enabled (`--dark-mode`)**: Activates dark mode, switching the interface to a dark color scheme for better visibility in low-light environments.
+  - **Disabled (default)**: Keeps the interface in the default light mode.
+
+**Example**:
+
+```bash
+python webui.py --ip 127.0.0.1 --port 7788 --dark-mode
+```
+
 ## (Optional) Configure Environment Variables
 
 Copy `.env.example` to `.env` and set your environment variables, including API keys for the LLM. With