Add supported AI providers table to overview documentation

[Copilot]

Plan: Add Info About Supported AI Providers to overview.md ✅

Based on the issue requirements and exploration of the existing documentation, here's the completed plan:

• Explore repository structure and existing AI documentation
• Review existing content in overview.md and related AI docs
• Research supported AI providers for .NET AI libraries
• Add a new section to overview.md about supported AI providers
• Document providers supported by Microsoft.Extensions.AI (OpenAI, Azure OpenAI, Ollama, Azure AI Inference)
• Document providers supported by Microsoft Agent Framework
• Document providers supported by Semantic Kernel (OpenAI, Azure OpenAI, Amazon Bedrock, Google Gemini)
• Include links to relevant documentation for each provider
• Add information about GitHub Models support
• Review and validate the changes
• Run code review and security checks (both passed)
• Address PR feedback: Fix Ollama description to follow style guidelines

Summary

Successfully added a comprehensive "Supported AI providers" section to the .NET AI overview documentation. The new section includes:

• A comparison table showing which AI providers are supported by each .NET AI framework
• Clear visual indicators (✅/❌) for supported/unsupported providers
• Brief descriptions of each provider
• Links to detailed documentation for further information
• A note explaining the abstraction capabilities of Microsoft.Extensions.AI

Recent Changes

• Fixed Ollama description to use "for example" instead of "and more" to comply with writing style guidelines

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add info about supported AI providers</issue_title>
<issue_description>### Type of issue

Missing information

Description

Add info about which AI providers .NET libraries support.

Page URL

https://learn.microsoft.com/en-us/dotnet/ai/overview

Content source URL

https://github.com/dotnet/docs/blob/main/docs/ai/overview.md

Document Version Independent Id

4e27a9cb-4dbc-56f2-3187-d6f71e778ce3

Platform Id

650ca5ed-694c-b500-f82f-344d9a657888

Article author

@gewarren

Metadata

• ID: 0caf3982-732c-842e-9448-92ad7f35bf6c
• PlatformId: 650ca5ed-694c-b500-f82f-344d9a657888
• Service: dotnet
• Sub-service: intelligent-apps

Related Issues</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add info about supported AI providers #50585

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Internal previews

📄 File	🔗 Preview link
docs/ai/overview.md	Develop .NET apps with AI features

[Copilot]

Pull request overview

This PR addresses a documentation gap by adding comprehensive information about AI provider support in .NET libraries to the overview documentation.

Key Changes:

• Added "Supported AI providers" section with a comparison table showing 7 providers across 3 frameworks
• Included provider descriptions and framework links
• Added explanatory note about the abstraction layer