Document iframe support and event isolation features

Add section for new features in version 2.1.0-alpha.

Author: ioa747

README.md

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 ### ⚖️ License
 
 This project is provided "as-is". You are free to use, modify, and distribute it for both personal and commercial projects.
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 <p align="center">
   <img src="https://raw.githubusercontent.com/andreasbm/readme/master/assets/lines/rainbow.png" width="100%">
 </p>
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 ## 🚀 What's New in v2.1.0-alpha - Frame Support & Event Isolation
 
 This patch introduces first-class support for `iframe` interaction, allowing developers to target specific frames for script execution, messaging, and host object binding.