Add comprehensive GitHub Copilot instructions for DendroDocs.Shared

[Copilot]

This PR implements comprehensive GitHub Copilot instructions specifically tailored for the DendroDocs.Shared library, following the established pattern from the dotnet-client-lib repository.

Changes Made

• Added .github/copilot-instructions.md with comprehensive guidelines for GitHub Copilot contributions
• Adapted content specifically for DendroDocs.Shared including:
  • Extension methods in DendroDocs.Extensions namespace
  • Data models (TypeDescription, MethodDescription, PropertyDescription, etc.)
  • JSON utilities in DendroDocs.Json namespace
  • Documentation comments parsing patterns
  • Statement models and control flow representations

Key Guidelines Included

Code Style & Conventions

• Modern C# patterns (null checking with is null, pattern matching)
• Parameter validation with ArgumentNullException.ThrowIfNull()
• Code organization following established namespace structure

Build System

• NUKE build system usage and available targets
• GitVersion requirements with full git history
• MSTest testing framework with Shouldly assertions

Project-Specific Patterns

// Extension method pattern
public static string ClassName(this string fullTypeName)
{
    ArgumentNullException.ThrowIfNull(fullTypeName);
    var lastDot = fullTypeName.LastIndexOf('.');
    return lastDot >= 0 ? fullTypeName[(lastDot + 1)..] : fullTypeName;
}

// JSON serialization pattern
var serializerSettings = JsonDefaults.SerializerSettings();
var result = JsonConvert.SerializeObject(types.OrderBy(t => t.FullName), serializerSettings);

Git Workflow

• Linear commit history preferences
• Descriptive commit message guidelines
• Pull request best practices

The instructions ensure consistent, high-quality contributions that align with the DendroDocs.Shared library's architecture and coding standards.

Fixes #45.

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[Copilot]

Pull Request Overview

This PR adds a new GitHub Copilot instruction document tailored for the DendroDocs.Shared library, outlining coding conventions, build processes, and project-specific patterns.

• Introduces .github/copilot-instructions.md with guidelines on code style, build system, testing, and workflow
• Details project-specific patterns for extension methods, data models, JSON utilities, and documentation parsing
• Specifies GitVersion, NUKE build targets, commit history, and testing frameworks

Comments suppressed due to low confidence (1)

.github/copilot-instructions.md:1

• [nitpick] Consider adding a table of contents after the title to improve navigation through this long guideline document.

# GitHub Copilot Instructions for DendroDocs.Shared

[coveralls]

Pull Request Test Coverage Report for Build 15993329326

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.104%

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Totals
Change from base Build 15905063830:	0.0%
Covered Lines:	567
Relevant Lines:	572

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 15993329323

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.104%

---

Totals
Change from base Build 15905063830:	0.0%
Covered Lines:	567
Relevant Lines:	572

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💛 - Coveralls