[New article]: AI text-to-image feature

[gewarren]

Create a tutorial that shows how to use the text to image features of Microsoft.Extensions.AI, including code examples in C#.

Proposed topic or title

AI text-to-image feature

Location in table of contents.

docs/ai/toc.yml

Sources:

• https://devblogs.microsoft.com/dotnet/explore-text-to-image-dotnet/
• https://github.com/jeremylikness/text2imagesample
• ericstj/imageGeneratorSample@8a97699
• Add image support to GenerativeAI.Microsoft gunpal5/Google_GenerativeAI#73

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Associated WorkItem - 486214