Authenticate to NuGet package feeds

[vicroms]

Document techniques to authenticate to NuGet package feeds within vcpkg (extracted from #420)

[learn-build-service-prod]

Learn Build status updates of commit aa062d0:

💡 Validation status: suggestions

File	Status	Preview URL	Details
vcpkg/consume/third-party-authentication.nuget.md	💡Suggestion	View	Details
vcpkg/TOC.yml	✅Succeeded	View

vcpkg/consume/third-party-authentication.nuget.md

• Line 65, Column 10: [Suggestion: learn-site-link-broken - See documentation] Link '/nuget/consume-packages/consuming-packages-authenticated-feed#security-best-practices-for-managing-credentials' points to a learn site page that doesn't exist. Check the path or URL and update the link.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

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[prmerger-automator]

PRMerger Results

Issue	Description
Added File(s)	This PR contains added files. New files require human review.
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.
File Change Percent	This PR contains file(s) with more than 30% file change.

[learn-build-service-prod]

Learn Build status updates of commit 8c69258:

💡 Validation status: suggestions

File	Status	Preview URL	Details
vcpkg/consume/third-party-authentication.nuget.md	💡Suggestion	View	Details
vcpkg/TOC.yml	✅Succeeded	View

vcpkg/consume/third-party-authentication.nuget.md

• Line 65, Column 10: [Suggestion: learn-site-link-broken - See documentation] Link '/nuget/consume-packages/consuming-packages-authenticated-feed#security-best-practices-for-managing-credentials' points to a learn site page that doesn't exist. Check the path or URL and update the link.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[prmerger-automator]

PRMerger Results

Issue	Description
Added File(s)	This PR contains added files. New files require human review.
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.
File Change Percent	This PR contains file(s) with more than 30% file change.

[learn-build-service-prod]

Learn Build status updates of commit 939338b:

✅ Validation status: passed

File	Status	Preview URL	Details
vcpkg/consume/third-party-authentication.nuget.md	✅Succeeded	View
vcpkg/TOC.yml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[prmerger-automator]

PRMerger Results

Issue	Description
Added File(s)	This PR contains added files. New files require human review.
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.
File Change Percent	This PR contains file(s) with more than 30% file change.