PR 8 — Null Safety: Overview, Nullable Value Types, Null Operators

[BillWagner]

Fixes #52837

Create the fundamentals/null-safety/ directory and three new articles (overview, nullable value types, null operators) with three corresponding snippet projects, then insert the section into toc.yml. All are brand-new files — no redirects needed. PR 9 handles the NRT, resolve-warnings, migration, and tutorial articles.

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Internal previews

📄 File	🔗 Preview link
docs/csharp/fundamentals/null-safety/index.md	C# null safety
docs/csharp/fundamentals/null-safety/null-operators.md	C# null operators
docs/csharp/fundamentals/null-safety/nullable-value-types.md	"Nullable value types: C# Fundamentals"
docs/csharp/toc.yml	Taken from https://github.com/dotnet/roslyn/wiki/Samples-and-Walkthroughs

[Copilot]

Pull request overview

This PR adds a new Null safety subsection to the C# Fundamentals docs, with three new articles and corresponding runnable snippet projects to support the content.

Changes:

• Adds a Null safety node to docs/csharp/toc.yml with links to three new Fundamentals articles.
• Introduces three new articles: overview, nullable value types, and null operators.
• Adds three new snippet projects (one per article) with sample code referenced via :::code includes.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/csharp/toc.yml	Adds the new Null safety subsection and links to the three new articles.
docs/csharp/fundamentals/null-safety/index.md	New overview article introducing null safety concepts and linking to related pages/snippets.
docs/csharp/fundamentals/null-safety/nullable-value-types.md	New article explaining nullable value types with referenced runnable snippets.
docs/csharp/fundamentals/null-safety/null-operators.md	New article covering null-related operators, including examples and referenced runnable snippets.
docs/csharp/fundamentals/null-safety/snippets/null-safety-overview/null-safety-overview.csproj	New snippet project for the overview article.
docs/csharp/fundamentals/null-safety/snippets/null-safety-overview/Program.cs	New overview snippets demonstrating null checks, NVT/NRT basics, and operator quick reference.
docs/csharp/fundamentals/null-safety/snippets/nullable-value-types/nullable-value-types.csproj	New snippet project for nullable value types.
docs/csharp/fundamentals/null-safety/snippets/nullable-value-types/Program.cs	New snippets demonstrating declaration, checks, fallbacks, and lifted operators for nullable value types.
docs/csharp/fundamentals/null-safety/snippets/null-operators/null-operators.csproj	New snippet project for null operators.
docs/csharp/fundamentals/null-safety/snippets/null-operators/Program.cs	New snippets demonstrating ?., ?[], ??, ??=, is null, and !.