Add PRD for Global Holiday Calculation System

[Copilot]

Generates language-agnostic Product Requirements Document for a Holiday Calculation System that extends beyond the existing Canada Day calculator to support multiple countries, regions, and cultural significance markers.

Documentation Delivered

• Holiday_Calculation_System_PRD.md (67KB): Complete PRD with 54 requirements (27 functional, 27 non-functional), 24 user stories, phased acceptance criteria, 12-month timeline, dependency analysis, and risk mitigation
• README_PRD.md: Navigation guide and document overview
• QUICK_START_GUIDE.md: Role-based reading paths for stakeholders, developers, and product managers
• PRD_DELIVERY_SUMMARY.md: Metrics and verification checklist
• INDEX_HOLIDAY_PRD.md: Comprehensive document index

Key Capabilities Specified

• Global scope: 150+ countries with regional variations (state/province/territory level)
• Historical + future calculation: 1600-present and 10+ years forward
• Cultural context: Religious holidays, national observances, commemorative dates
• Multi-calendar support: Gregorian, lunar, religious calendar systems

Implementation Neutral

Deliberately avoids language-specific terminology or patterns. Suitable for implementation in any stack (Python, Java, Go, JavaScript, etc.). Contains no COBOL references despite being derived from existing CANDAY01.CBLLE program analysis.

Location: /docs/Holiday_Calculation_System_PRD.md

Original prompt

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This section details on the original issue you should resolve

<issue_title>Please create a new Program that calculates the Holidays for a given country</issue_title>
<issue_description>WE need to be able to generate a new Cobol program that is able to determine based on input a country name, region and cultral significance when a holiday was in the future or historically.</issue_description>

Comments on the Issue (you are @copilot in this section)

Custom agent used: PRD Generator Agent
Generate a new PRD (Product Requirements Document)

• Fixes Please create a new Program that calculates the Holidays for a given country #21

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