Document central nuget feed in CONTRIBUTING.md

[hallipr]

What does this PR do?

This pull request updates the documentation and configuration to clarify and reinforce the use of a central Azure DevOps NuGet feed for package management. The main changes include expanded instructions in CONTRIBUTING.md about the central NuGet feed and a reference comment in nuget.config.

Documentation updates:

• Added a new "Central NuGet Feed" section to CONTRIBUTING.md, providing detailed instructions on using the Azure DevOps package feed, including authentication steps and guidance for external contributors.
• Updated the Table of Contents in CONTRIBUTING.md to include the new "Central NuGet Feed" section.

Configuration updates:

• Added a reference comment in nuget.config pointing to the central feed documentation in CONTRIBUTING.md.

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Created a changelog entry if the change falls among the following: new feature, bug fix, UI/UX update, breaking change, or updated dependencies. Follow the changelog entry guide
• For MCP tool changes:
  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Validate README.md changes running the script ./eng/scripts/Process-PackageReadMe.ps1. See Package README
  • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For tools with new names, including new tools or renamed tools, update consolidated-tools.json
  • For renamed tools, follow the Tool Rename Checklist and tag the PR with the breaking-change label
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description
• Extra steps for Azure MCP Server tool changes:
  • Updated command list in servers/Azure.Mcp.Server/docs/azmcp-commands.md
  • Ran ./eng/scripts/Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • Updated test prompts in servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs:
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR documents and reinforces using a single, central Azure DevOps NuGet feed for restores by updating contributor guidance and adding a pointer comment in nuget.config.

Changes:

• Added a “Central NuGet Feed” section to CONTRIBUTING.md, including auth guidance and notes for external contributors.
• Updated CONTRIBUTING.md Table of Contents to include the new section.
• Added a comment in nuget.config referencing the documentation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
nuget.config	Adds a documentation pointer comment to reinforce the central-feed policy.
CONTRIBUTING.md	Adds detailed contributor documentation for the central Azure DevOps NuGet feed and updates the ToC accordingly.

[jongio]

Helpful addition - the central feed setup has been a common friction point for new contributors. Instructions are clear, and the external contributor workaround is practical.