[DOCS] Add Diagrams to EM1 Chapter 2 — Linear Algebra

[SG170]

📌 Issue: Add Diagrams to EM1 Chapter 2 — Linear Algebra

Description

The Chapter 2 notes for Engineering Mathematics I (/sem1/em1/ch2) are currently text-only. Each section has a placeholder comment like Diagram: filename.png but no actual diagrams have been added yet.

This issue tracks adding visual diagrams for all placeholder sections to improve student understanding.

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Sections needing diagrams

• Algebra of Matrices → matrix-algebra.png
• Rank and Inverse of a Matrix → rank-echelon.png
• Numerical Methods (Gauss, Gauss Jordan, Gauss Seidel) → gauss-methods.png

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Proposed Solution

Create clear, labeled SVG/PNG diagrams for each of the above topics and replace the placeholder comments with proper <img> tags.

Diagrams will cover:

• Matrix multiplication layout and transpose operation
• Row echelon form transformation to find rank
• Gauss elimination vs Gauss Jordan vs Gauss Seidel comparison flowchart

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Why this matters

Matrix operations and row reduction are procedural and spatial. Visual step-by-step diagrams help students understand how rank is found, how elimination proceeds, and how transformations are applied — far better than equations alone.

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Would like to work on this

I'd like to take this up as part of GSSoC. Please assign this issue to me.

Note to maintainer: If there's a preferred folder path for images or a specific format (SVG vs PNG, size/style guidelines), please let me know before I open the PR.