Implement a `.editorconfig` in the project for autoformatting

[o-l-a-v]

Summary of the new feature / enhancement

Would be great if this repo could get a .editorconfig to make sure all code looks and feels the same. And then also set editor.autoFormatOnSave in .vscode\settings.json.

Here are some other projects that have it (inspiration):

• PowerShell/PowerShell: https://github.com/PowerShell/PowerShell/blob/master/.editorconfig
• dotnet/roslyn: https://github.com/dotnet/roslyn/blob/main/.editorconfig
• dotnet/runtime: https://github.com/dotnet/runtime/blob/main/.editorconfig

Here's documentation on autoformatting with the VSCode C# Dev Kit using EditorConfig:

• https://code.visualstudio.com/docs/csharp/formatting-linting
• https://learn.microsoft.com/en-ca/dotnet/fundamentals/code-analysis/code-style-rule-options
  • Example file: https://learn.microsoft.com/en-ca/dotnet/fundamentals/code-analysis/code-style-rule-options#example-editorconfig-file

Relevant VSCode extensions:

• C# Dev Kit: https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csdevkit
• EditorConfig for VSCode: https://marketplace.visualstudio.com/items?itemName=EditorConfig.EditorConfig

Proposed technical implementation details (optional)

Create .editorconfig, use mentioned projects as starting point.