chore: support local NuGet source via NOSCORE_LOCAL_PACKAGES env var

[erwan-joly]

Summary

• Adds a conditional RestoreAdditionalProjectSources PropertyGroup to Directory.Build.props that activates only when NOSCORE_LOCAL_PACKAGES is set.
• No runtime cost for contributors who don't opt in — the property group is skipped, restore uses nuget.org only.
• Documents the setup in README section 5.

Test plan

• dotnet restore succeeds with NOSCORE_LOCAL_PACKAGES unset.
• dotnet restore with NOSCORE_LOCAL_PACKAGES pointing to a folder with a .nupkg picks it up.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8fc131d and eaf705e.

📒 Files selected for processing (2)

• Directory.Build.props
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/nuget-local-source

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