spec: add waffle-basic specification

[github-actions]

New Specification: waffle-basic

Closes #998

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specification.md

waffle-basic: Basic Waffle Chart

Description

A waffle chart displays proportions using a grid of equal-sized squares where colored squares represent parts of a whole. Each square typically represents 1% of the total, making it easy to count and compare values visually. It provides an intuitive alternative to pie charts, offering more accurate perception of proportions.

Applications

• Visualizing survey results and polling data to show response distributions
• Displaying budget allocation across spending categories
• Tracking progress towards goals (e.g., fundraising at 73% of target)
• Showing demographic breakdowns in population studies

Data

• category (categorical) - Category labels for each segment
• value (numeric) - Proportions or percentages for each category
• Size: 2-6 categories typical
• Note: Values should sum to 100 or be normalized to percentages

Notes

• Standard grid is 10x10 (100 squares) where each square = 1%
• Use distinct, contrasting colors for each category
• Include a legend identifying categories with their percentages
• Round values to whole squares for clean visualization

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Next: Add approved label to the issue to merge this PR.

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