chore(code): initial scaffolding

[Flash0ver]

Initial scaffolding

[Copilot]

Pull request overview

Note

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Adds baseline .NET repository configuration to standardize builds, package restore, analyzers, and editor settings.

Changes:

• Introduces solution-level MSBuild configuration (Directory.Build.props/targets) and central package management (Directory.Packages.props).
• Pins the .NET SDK via global.json and configures NuGet sources via nuget.config.
• Adds repo hygiene/config files (.editorconfig, .gitignore, .gitattributes) and a .slnx solution descriptor.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
source/FlashOWare.CommandLine.slnx	Adds a solution descriptor referencing shared repo configuration files.
source/Directory.Packages.props	Enables Central Package Management configuration scaffold.
source/Directory.Build.targets	Adds an (currently empty) repo-wide MSBuild targets hook.
source/Directory.Build.props	Adds repo-wide compiler/analyzer and artifacts output settings.
source/.editorconfig	Establishes formatting and .NET code style/analyzer preferences.
nuget.config	Configures NuGet to use only nuget.org as a package source.
global.json	Pins a .NET SDK version and specifies a test runner configuration.
.gitignore	Adds standard Visual Studio/.NET ignore patterns.
.gitattributes	Adds standard Git attributes for line endings and diff drivers.

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