Add AgentSamples project to repository

[Copilot]

Creates a new sample project demonstrating basic OpenAI Agent usage with Semantic Kernel.

Changes

• New project: SKSampleCSharp/AgentSamples/

  • Console application targeting .NET 8.0
  • Dependencies: Microsoft.SemanticKernel 1.18.2, Microsoft.SemanticKernel.Agents.OpenAI 1.18.2-alpha
  • Implements basic OpenAI Assistant Agent with Azure OpenAI integration

• Solution integration: Added as "49AgentSamples" to SKSample.sln with standard Debug/Release configurations

Implementation

The sample follows the existing pattern from OpenAIAgent and SKAgent projects:

var openAIClientProvider = OpenAIClientProvider.ForAzureOpenAI(
    new ApiKeyCredential(Config.ApiKey), 
    new Uri(Config.Endpoint));

OpenAIAssistantDefinition assistantDefinition = new(Config.ModelName)
{
    Name = "Agent Sample Assistant",
    Instructions = "You are a helpful AI assistant. Answer questions based on user input."
};

var agent = await OpenAIAssistantAgent.CreateAsync(kernel, openAIClientProvider, assistantDefinition);

Original prompt

create new repro called "AgentSamples"

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