This PR adds comprehensive documentation for the GetExternalFrame Drapo function, which enables communication between the main page and embedded iframes by calling functions within those iframes and storing the results.

Function Overview

GetExternalFrame retrieves data from an external iframe by calling a specified function within that iframe and storing the result in a data key. This function is essential for cross-frame communication in Drapo applications.

Parameters

• frameID (string, required): The ID of the iframe element from which to retrieve data
• externalFunction (string, required): The name of the function to call within the iframe to retrieve data
• dataKey (string, required): The data key where the retrieved data will be stored
• isClone (boolean, optional): Whether to clone the retrieved data before storing it (defaults to false)

Implementation

The documentation includes:

• Function description explaining iframe communication capabilities
• Complete parameter definitions with proper types and descriptions
• Functional sample with an actual iframe element and corresponding iframe content
• Sample iframe content (sampleIframe.html) with a working GetSampleData() function that returns sample data
• Demonstration of real cross-frame communication between parent and iframe

The sample now properly demonstrates the GetExternalFrame function by including:

1. An iframe element with ID "myExternalFrame"
2. Iframe content that contains the referenced GetSampleData() function
3. Working example of retrieving and displaying data from the iframe

Fixes #225.

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