Use DotNetCampus instead of dotnetCampus as package id

[walterlv]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the package identifier from "dotnetCampus.LatestCSharpFeatures" to "DotNetCampus.LatestCSharpFeatures" to follow proper .NET naming conventions with Pascal case. The change also includes a version bump from 12.0.1 to 13.0.0.

• Update package ID to use proper Pascal case naming convention
• Bump package version from 12.0.x to 13.0.0
• Update all references and documentation to reflect the new package name

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/DotNetCampus.LatestCSharpFeatures/DotNetCampus.LatestCSharpFeatures.csproj	Updates the PackageId property to use Pascal case naming
tests/DotNetCampus.LatestCSharpFeatures.Tests/DotNetCampus.LatestCSharpFeatures.Tests.csproj	Updates package reference to use new naming and version
README.md	Updates all documentation references to use the new package name and version

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}