Add C# sample projects using MEAI and Semantic Kernel for chat completions with foundry local

[elbruno]

This pull request introduces two new C# sample projects demonstrating chat completion functionality using Foundry Local with different SDKs, updates the solution file to include these projects, and provides documentation for running the samples. Below are the most important changes grouped by theme:

New Sample Projects

• Added FoundryLocal-01-MEAI-Chat project to demonstrate chat completion using Foundry Local and the MEAI SDK. Includes project file FoundryLocal-01-MEAI-Chat/FoundryLocal-02-MEAI-Chat.csproj and implementation in Program.cs. [1] [2]
• Added FoundryLocal-01-SK-Chat project to demonstrate chat completion using Foundry Local and Semantic Kernel. Includes project file FoundryLocal-01-SK-Chat/FoundryLocal-01-SK-Chat.csproj and implementation in Program.cs. [1] [2]

Solution File Updates

• Updated csharp_samples.sln to include the new sample projects, enabling them to be built and run as part of the solution.

Documentation Updates

• Added a readme.md file in the samples/cs/ directory to provide an overview of the sample projects, prerequisites, and instructions for running them.

[samuel100]

Would it be possible to use the Foundry Local C# SDK to get the baseUrl and apiKey - in a future release, the Port and Key will be dynamically set by foundry on start up.

Example of SDK:

var alias = "phi-3.5-mini";

var manager = await FoundryManager.StartModelAsync(aliasOrModelId: alias);

var model = await manager.GetModelInfoAsync(aliasOrModelId: alias);
ApiKeyCredential key = new ApiKeyCredential(manager.ApiKey);
OpenAIClient client = new OpenAIClient(key, new OpenAIClientOptions
{
    Endpoint = manager.Endpoint
});

The official NuGet should be release this week. In the meantime, you could build from source to test.

[samuel100]

Would it be possible to use the SDEK to get the baseUrl and apiKey in future releases these will be dynamically set.

[samuel100]

@elbruno - thank you so much for the contribution 🙏!!! Would it be possible to use the SDK to get the URL and Key? The official NuGet will be coming this week (all going well). In the meantime you can build from source.