[WIP] Create a command called Add-ItemToProject

[Copilot]

• Create GraphQL query files
  • Create getResourceId.query for URL to resource ID translation
  • Create projectInfo.query for retrieving project info without items
  • Create addItemToProject.mutant for adding items to a project
• Implement driver functions in driver_gh.ps1
  • Implement Invoke-GitHubGetResourceId function
  • Implement Invoke-GitHubGetProjectInfo function
  • Implement Invoke-GitHubAddItemToProject function
• Create Add-ItemToProject.ps1 function
  • Implement main Add-ItemToProject function
• Add tests
  • Create mock files for tests
  • Create tests for each function
• Verify functionality works end-to-end

The implementation is now complete. We've created:

1. GraphQL query files for resource ID translation, project info retrieval, and adding items to projects
2. Driver functions to interact with the GitHub GraphQL API
3. The main Add-ItemToProject function that combines these operations
4. Tests with mock responses to verify functionality

Fixes #2.

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