Add color blindness accessibility guidelines (#40)

color-blindness-guidelines.md

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+# Color Blindness (Color Vision Deficiency) Guidelines
+
+## Overview
+Color blindness, also called color vision deficiency (CVD), is a condition where individuals have difficulty distinguishing between certain colors. Severity ranges from mild to severe.
+
+## Types
+- **Red-Green Deficiency:** Most common; difficulty differentiating red and green.
+- **Blue-Yellow Deficiency:** Less common; difficulty with blue and yellow hues.
+- **Total Color Blindness (Achromatopsia):** Very rare; world seen in grayscale.
+
+## Causes
+- Mostly genetic and inherited
+- Diseases like diabetes or multiple sclerosis
+- Aging or certain medications
+
+## Symptoms
+- Trouble identifying colors or matching them correctly
+- Headaches or eye strain with conflicting color backgrounds
+- Relying on brightness or texture instead of color
+
+## Inclusivity Guidelines
+- Use **high-contrast, color-blind-friendly palettes**
+- Avoid conveying information **only with color**; include patterns, text labels, or symbols
+- Use accessible digital design guidelines (WCAG)
+- Presentations, charts, and teaching materials should have **alternative indicators**
+- Early screening and awareness help support inclusive participation
+- Tools: [DaltonLens Colorblind Simulator](https://daltonlens.org/colorblindness-simulator)
+
+## Goal
+To create an environment where color-blind individuals can engage fully without barriers.