Transform repository into comprehensive Git & GitHub workshop for Penn graduate students

[Copilot]

This PR transforms the minimal repository into a complete, hands-on Git and GitHub workshop designed specifically for Penn graduate students who are new to version control.

What's Added

Comprehensive Workshop Guide

• Enhanced README.md: Complete tutorial covering Git fundamentals, branching/merging, and GitHub collaboration
• Workshop Agenda: Detailed 2-hour structured agenda for instructors
• Git Cheat Sheet: Quick reference guide for all essential Git commands

Hands-On Learning Materials

• Exercise 1: Creating first repository and basic Git workflow
• Exercise 2: Working with branches and parallel development
• Exercise 3: GitHub collaboration using forks and pull requests
• Example Files: Sample research project and executable script for demonstrations
• Participants File: Interactive file for practicing GitHub collaboration

Key Features

Beginner-Friendly: Assumes no prior Git experience and provides step-by-step instructions
Research-Focused: Examples and scenarios relevant to academic collaboration
Progressive Learning: Three exercises that build skills incrementally
Self-Contained: Repository serves as both documentation and practice environment

Repository Structure

git_workshop/
├── README.md                 # Main workshop guide (269 lines)
├── git-cheat-sheet.md       # Command reference (140 lines)  
├── workshop-agenda.md       # Instructor agenda (100 lines)
├── participants.md          # Collaboration exercise file
├── exercises/               # Three hands-on exercises
└── examples/               # Sample files for practice

The repository now provides everything needed for a successful Git workshop, transforming it from a simple placeholder into a complete educational resource that Penn graduate students can use to learn version control fundamentals and GitHub collaboration workflows.

Ready for immediate use - instructors can clone this repository and begin teaching the workshop using the provided agenda and materials.

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