Add GitHub issue templates for bug reports and feature requests

[Copilot]

Added structured YAML-based issue forms to streamline bug reports and feature requests with auto-labeled, validated submissions.

Changes

• Bug Report Template (bug_report.yml)

  • Structured fields: description, reproduction steps, expected/actual behavior, code samples
  • Required inputs: library version, .NET version (dropdown), OS
  • C# syntax highlighting for code blocks
  • Validation checklist for duplicate checking
  • Auto-applies bug label

• Feature Request Template (feature_request.yml)

  • Structured fields: problem statement, proposed solution, alternatives, usage examples, benefits
  • Priority dropdown (Low/Medium/High) and contribution willingness selector
  • C# syntax highlighting for code examples
  • Validation checklist
  • Auto-applies enhancement label

• Template Configuration (config.yml)

  • Disables blank issues to enforce template usage
  • Contact links for Discussions (questions) and Security Advisories

Both templates use GitHub's modern issue forms (YAML) instead of markdown templates, providing native form validation and better UX.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Issue templates should be created</issue_title>
<issue_description>Issue templates should be created for bug reports and feature requests.</issue_description>

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

• Fixes Issue templates should be created #19

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