[WIP] Add the drapo function called 'SetExternalFrameMessage'

[Copilot]

Adding documentation for the Drapo function 'SetExternalFrameMessage' based on the main Drapo repository implementation.

Plan:

• Explore repository structure and understand function documentation format
• Research SetExternalFrameMessage function implementation in main Drapo repo
• Verify current build works properly
• Create SetExternalFrameMessage function directory structure
• Create description.html with function overview
• Create parameters.json with parameter specifications
• Create sample directory with working example
• Verify function appears in documentation system
• Test the documentation rendering

Function Details:

The SetExternalFrameMessage function sends messages to external iframes using the postMessage API. It takes 4 parameters:

1. FrameID - The ID of the iframe element
2. ExternalFunction - The tag/function name for the message
3. DataKey - The data storage key to send
4. IsClone - Whether to clone the data (optional, defaults to false)

Fixes #227.

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[silvath]

@copilot can hou finish ?

[Copilot]

@copilot can hou finish ?

Yes, the SetExternalFrameMessage function documentation is now complete! ✅

All required components have been implemented:

• Function description explaining postMessage API usage
• Complete parameters.json with all 4 parameters (FrameID, ExternalFunction, DataKey, IsClone)
• Two working samples demonstrating different use cases
• Build verification passed successfully

The documentation is ready and the function now appears in the Drapo documentation system. Commit: 3eb663d