Add comprehensive feature roadmap with 92+ proposed enhancements

[Copilot]

Created strategic planning documentation identifying 92+ features to transform Visual Calculus from a basic tool into a professional-grade calculus visualization platform.

Documentation Added

• FEATURE_ROADMAP.md - Detailed feature descriptions, 4-phase implementation plan (6-8 months), technical architecture recommendations, priority matrix
• FEATURES_SUMMARY.md - Quick reference organized by category, top 10 high-impact features, phase-based priorities
• README.md - Updated with project overview, installation instructions, links to roadmap

Feature Categories

Organized into 10 categories with implementation priorities:

Phase 1 (Critical - 1-2 months)

• Riemann Sums visualization with convergence animation
• Taylor/Maclaurin series expansion
• Interactive parameter sliders for real-time exploration
• Limits calculator with asymptote detection
• Dark theme, PNG/PDF export

Phase 2 (High Value - 2-3 months)

• Volume of revolution with 3D rendering
• Multi-variable calculus (partial derivatives, 3D surface plots, gradient fields)
• Numerical methods (Newton-Raphson, bisection, ODE solvers with slope fields)
• Parametric/polar curves, concavity/monotonicity shading

Phase 3 (Polish - 1-2 months)

• Modular architecture refactor (separate UI/logic/visualization)
• Advanced topics (Fourier series, vector calculus, complex functions)
• Performance optimization (caching, async plotting)

Architecture Recommendation

Current single-file structure should migrate to:

visual_calculus/
├── ui/tabs/          # Feature-specific tabs
├── calculus/         # Symbolic, numerical, analysis
├── visualization/    # 2D/3D plots, themes
└── tests/

Enables plugin architecture, better separation of concerns, team collaboration.

Original prompt

Deeply evaluate and give me a list of features that we can add

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