[DOCS] Create Browser Setup Guide

[saketsarin]

Describe the solution you'd like
Create a detailed guide for setting up different browsers (Chrome, Edge, Brave, etc.) for use with the extension across various platforms.

Tasks

• Document setup steps for Chrome, Edge, and Brave on Windows, macOS, and Linux
• Include screenshots of browser launch parameters
• Document how to create browser shortcuts with debugging enabled
• Add a section about debugging port security considerations

Technical Details

• Create a new markdown file in the repository: BROWSER_SETUP.md
• Link to this document from the main README.md
• Include command-line examples for each browser and platform