Add .editorconfig file & include solution-level files within the solution.

[tylerwarner33]

Add a common .editorconfig file from the official '.NET Platform' to implement coding/formatting standards across the repository.
(tabs vs spaces, naming conventions, etc.)
https://github.com/dotnet/runtime/blob/main/.editorconfig

Include the solution-level items within the solution to see all of the included files that it is working with.

[Copilot]

Pull Request Overview

This PR adds standardized coding/formatting conventions to the repository by introducing an .editorconfig file from the official .NET Platform and organizing solution-level files within the Visual Studio solution for better visibility.

• Adds comprehensive .editorconfig file with .NET coding standards including formatting, naming conventions, and code style rules
• Includes solution-level files (like .gitignore, README.md, etc.) in a new "Solution Items" folder within the Visual Studio solution
• Restructures the solution file to include an ExtensibilityGlobals section with a SolutionGuid

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
Aps.Sdk.sln	Adds Solution Items folder containing project files and reorganizes GlobalSection order
.editorconfig	New comprehensive configuration file defining coding standards, formatting rules, and naming conventions for .NET development

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