adding dotnet and dotnet-diag as remote plugins

[ManishJayaswal]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• I have read and followed the Guidance for submissions involving paid services.
• My contribution adds a new instruction, prompt, agent, skill, or workflow file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

adding dotnet and dotnet-diag as remote plugins which have skills for some common .NET developer tasks

Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• Update to existing instruction, prompt, agent, plugin, skill, or workflow.
• Other (please specify):

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Additional Notes

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

Adds two external (remote) plugin listings so they appear in the Awesome Copilot plugin marketplace and website data as externally hosted plugins.

Changes:

• Register dotnet external plugin (from dotnet/skills) with metadata and GitHub source path.
• Register dotnet-diag external plugin (from dotnet/skills) with metadata and GitHub source path.
• Update generated marketplace registry to include both new external plugins.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
plugins/external.json	Adds dotnet and dotnet-diag external plugin entries (used as the source-of-truth for external plugin registry).
.github/plugin/marketplace.json	Adds the corresponding generated marketplace entries so the plugins show up in the marketplace output.

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