README.md: Add screenshot

To add a screenshot to your README.md file:

1. Capture the screenshot: Take a clear and representative screenshot of your application. Make sure it shows the important features and user interface.

2. Save the image: Save the screenshot as a file with a common image format such as PNG or JPG.

3. Add the image to your README.md: Insert the image into your README.md file using markdown syntax. For example:

![Screenshot of my application](path/to/screenshot.png)

Replace path/to/screenshot.png with the actual path to the saved image file on your computer.

4. Update the description: Add a brief description of the screenshot below the image. This will help users understand what they are looking at.

For example:

![Screenshot of my application](path/to/screenshot.png)

This is a screenshot of my application, showing the main dashboard and some of its features.

The updated section of your README.md file might look something like this:

## Screenshot

![Screenshot of my application](path/to/screenshot.png)

This is a screenshot of my application, showing the main dashboard and some of its features.