Milestone 4: add milestone 3 meeting minutes to repo

[doctorbanu]

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name: milestone 3 meeting minutes
about: Updates meeting-minutes README with Milestones 3 and 4 and adds full meeting notes for milestone 3.

Summary

This PR updates the meeting-minutes folder README by adding the completed Milestone 3 and Milestone 4 sections. And also completely new file for Milestone 3 meeting notes.

Changes Included

• Added Milestone 3: Model Benchmarking & Data Collection (README file)
• Added Milestone 4: Human Evaluation & Survey Analysis (README file)
  Maintained the same formatting, tone, and structure as previous milestones
  Improved clarity and chronological continuity across the document
• Added milestone3_meetings file with milestone 3 notes

General Checks

• the branch is up to date with main
• the code works when pulled and run locally
• All CI checks pass (or at least discussed)
• all conflicts are resolved (if any)
• PR has a descriptive title
• PR has appropriate labels and milestones for easy identification
• PR it is assigned to the owner
• reviewers are assigned
• the PR contributes only one focused change
• It is in the appropriate column in the project board (if necessary)
• has short and clear description
• is linked to an issue (if it is related)
• feedback is addressed (if any and if it is appropriate feedback.)

Markdown

• the markdown source is formatted
• spelling and grammar is correct in all text
• The markdown looks correct when you preview the file
• all links and images work