docs: Add comprehensive PROJECT_SUMMARY.md for createGrid web application

[open-swe-dev-marco]

Fixes #2

Project Summary Documentation

This pull request adds a comprehensive PROJECT_SUMMARY.md document that provides an in-depth overview of the createGrid web application. The documentation covers:

Key Deliverables

• Detailed project overview
• Technical architecture breakdown
• Comprehensive file structure documentation
• Technology stack analysis
• Detailed feature descriptions
• Usage instructions
• Development roadmap

Documentation Sections Included

• Project Overview
• Technical Architecture
• Core JavaScript Classes Documentation
• MATLAB Integration Component
• Technical Features Overview
• Implementation Details

Documentation Highlights

• Analyzed 28 files across 7 directories
• Documented 8 shape types and their applications
• Detailed grid-based coordinate system
• Comprehensive MATLAB integration workflow
• Explained p5.js and Bootstrap UI implementation

The documentation serves as a comprehensive reference for developers, users, and potential contributors, providing both high-level project understanding and technical implementation details.

Recommended Next Steps

• Review the comprehensive documentation
• Validate technical accuracy
• Consider using the document for project onboarding and knowledge transfer