Add project infrastructure: issue templates, quality checks, and documentation

[Copilot]

Establishes project standards for contributions, automated quality enforcement, and dependency management.

GitHub Configuration

• Issue templates: Bug report (🐛) and feature request (✨) forms with structured fields
• Issue config: Disables blank issues, adds contact links to docs and discussions
• Dependabot: Weekly grouped updates for GitHub Actions and NuGet packages

Quality Enforcement

• Spelling: .cspell.json with project dictionary (weasyprint, dotnet, etc.)
• Markdown linting: .markdownlint.json with relaxed line length rules
• CI job: Quality Checks runs before build, validates all markdown files using npx

quality-checks:
  runs-on: ubuntu-24.04
  permissions:
    contents: read
  steps:
    - name: Check Spelling
      run: npx cspell "**/*.md"
    - name: Lint Markdown
      run: npx markdownlint-cli "**/*.md"

Documentation

• CODE_OF_CONDUCT.md: Contributor Covenant v2.0
• SECURITY.md: Vulnerability reporting via GitHub Security Advisories
• CONTRIBUTING.md: Guidelines for contributions, emphasizes quality checks before PR
• AGENTS.md: AI agent instructions for maintaining project standards

README Updates

• Added NuGet package badge
• Converted inline links to reference format for maintainability
• Critical: All links use absolute URLs (README is distributed in NuGet package)
• Added Contributing, Security, and Code of Conduct sections

[![NuGet][nuget-badge]][nuget-url]

[nuget-badge]: https://img.shields.io/nuget/v/DEMAConsulting.WeasyprintTool
[nuget-url]: https://www.nuget.org/packages/DEMAConsulting.WeasyprintTool/

Requirements Documentation

Both AGENTS.md and CONTRIBUTING.md explicitly document:

• README.md must use absolute URLs (NuGet distribution constraint)
• All markdown must pass cspell and markdownlint before commit
• All markdown files use reference-style links

Original prompt

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This section details on the original issue you should resolve

<issue_title>Project Improvements</issue_title>
<issue_description>The following project improvements are needed:

• GitHub issue templates for bug reporting and feature requests with appropriate icons.
• GitHub issue template configuration to disable blank issues and add contact links
• GitHub dependabot configuration file to keep dependencies updated (grouping dependencies for fewer pull requests)
• A .cspell.json file for spelling enforcement
• A .markdownlint.json file for enforcing markdown file formatting.
• A new "Quality Checks" job added to the build_on_push.yaml file to check spelling and markdown linting
• The "Quality Checks" job should use npx to install and run cspell and markdownlint-cli
• A standard CODE_OF_CONDUCT.md file should be added
• A CONTRIBUTING.md file should be added
• A SECURITY.md file should be added
• An AGENTS.md file should be added
• The README.md file should be improved, and include a badge for NuGet which links to the latest Nuget.org package
• All Markdown links should use the Markdown link reference format
• The README.md file should only contain absolute URL links as it will be distributed in the NuGet package - this should be documented in the AGENTS.md file and the CONTRIBUTING.md file
• The AGENTS.md file should contain instructions that the spelling and markdown linting rules should be followed when performing updates and checked as part of testing the changes.</issue_description>

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

• Fixes Project Improvements #6

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