Add CM_screen.png image to Features section in README.md

[Copilot]

This PR adds the existing CM_screen.png image to the Features section of the README.md file to better illustrate the CellMapper GoogleLocator extension functionality.

Changes Made

• Added ![CellMapper GoogleLocator Screenshot](CM_screen.png) to the Features section
• Used standard Markdown image syntax with descriptive alt text
• Positioned the image after the feature bullet points for logical flow
• Maintained existing formatting and spacing

Visual Result

The image now displays in the Features section showing the extension's interface with the "Locate with Google API" functionality and links to mapping services:

This enhancement provides users with a clear visual representation of what the extension looks like when integrated with CellMapper, making the documentation more informative and user-friendly.

Technical Details

• Files modified: README.md (1 line added)
• Image file: CM_screen.png (already existed in repository)
• Markdown syntax: Standard ![alt text](image_path) format
• No breaking changes: Pure documentation enhancement

This pull request was created as a result of the following prompt from Copilot chat.

Add the image CM_screen.png to the README.md file in the Features section. The image should be embedded using standard Markdown syntax and displayed clearly within that section.

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