[WIP] Add WinForms app for creating Pareto charts

[Copilot]

• Create C# WinForms project structure (ParetoTool.csproj)
• Implement data models (ParetoData, ChartSettings, ProjectFile)
• Implement services (CsvDataService, ChartService, ProjectService)
• Implement Pareto calculation helper
• Create MainForm (project management with menu)
• Create ChartEditorForm (chart creation/editing with data source selection)
• Create DataInputForm (manual data entry grid)
• Create ChartSettingsForm (title and axis label editing)
• Build and verify the project compiles
• Add .gitignore for build artifacts

Original prompt

Create a winforms app using c# that will be used to create Pareto Charts. Allow the user to select the data source. Allow the user to edit the heading of the chart and axis. Also allow the user to store each chart's data source and other information in settings files. Also allow the user to combine multiple charts in a project file.

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[scottcantwell]

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