Add NuGet server.

[Adam Driscoll (adamdriscoll)]

This pull request introduces a new NuGet V3 package feed module for PowerShell Universal, providing endpoints for package publishing, search, retrieval, and management, as well as on-disk storage and metadata generation. It includes a PowerShell module manifest, published folder setup, endpoint definitions, and a comprehensive README.

NuGet V3 Feed Implementation

• Added a new PowerShell module manifest (PowerShellUniversal.NuGet.psd1) defining exported functions for managing NuGet packages, metadata, and repository operations.
• Implemented published folder setup in publishedFolders.ps1 to ensure required directories for the flat container and registration metadata are created and exposed as static folders.
• Defined multiple NuGet-compatible API endpoints in endpoints.ps1 for service index, package search, autocomplete, flat container, registration, publishing, unlisting/relisting, catalog listing, and hard-deletion. Endpoints include authentication and role-based access where appropriate.

Documentation

• Added a detailed README.md describing all endpoints, configuration options, publishing instructions, and maintenance commands for the new NuGet feed module.

[Copilot]

Pull request overview

This PR adds a NuGet v3 feed implementation to the PowerShell Universal Gallery repo, including a PowerShell module that manages on-disk package storage and metadata generation, plus PSU endpoint and published-folder wiring and accompanying documentation.

Changes:

• Added PowerShellUniversal.NuGet module (psm1 + manifest) implementing catalog storage, metadata generation, and search/autocomplete behaviors.
• Added PSU endpoint definitions and published-folder mounts to expose NuGet-compatible routes.
• Added a README documenting endpoints, configuration, publishing, and maintenance.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
APIs/NuGet/README.md	Documents feed endpoints, configuration, publishing workflow, and maintenance commands.
APIs/NuGet/PowerShellUniversal.NuGet.psm1	Implements repository storage layout, catalog I/O, metadata generation, and search/autocomplete logic.
APIs/NuGet/PowerShellUniversal.NuGet.psd1	Module manifest exporting the public functions for the NuGet feed module.
APIs/NuGet/.universal/publishedFolders.ps1	Creates and publishes static folders for flat-container and registration metadata.
APIs/NuGet/.universal/endpoints.ps1	Defines NuGet-compatible PSU API endpoints (index, search, autocomplete, flat container, registration, publish, unlist/relist, delete).

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