Add browserstack attribution

[mbrevda]

Add the following to the readme, at the bottom:

This project is tested with BrowserStack.

[pullfrog]

Plan for #1011: Add BrowserStack attribution

Summary: Add a BrowserStack attribution line at the bottom of README.md.

Steps

1. Edit README.md: Append a new section after the License section (line 205):

   ## BrowserStack
   
   This project is tested with BrowserStack.
   

Verification

• Visual check that the README renders the new section correctly.

Files affected

• README.md (1 line addition)

Estimated effort

~5 minutes. This is a straightforward documentation-only change with no code or test impact.

Task list (2/3 completed)

• Analyze the task and gather context (read README, issue comments)
• Produce a structured, actionable plan with clear milestones
• Call pullfrog_report_progress with the plan body

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[pullfrog]

Added a BrowserStack attribution section to README.md. PR: #1012

Task list (3/3 completed)

• Create branch for the change
• Add BrowserStack section to README.md
• Commit, push, create PR, and report progress

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