chore: import upstream snapshot with attribution

dotnet/samples/Demos/ContentSafety/Controllers/ChatController.cs

@@ -0,0 +1,35 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using ContentSafety.Models;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.SemanticKernel;
+
+namespace ContentSafety.Controllers;
+
+/// <summary>
+/// Sample chat controller.
+/// </summary>
+[ApiController]
+[Route("[controller]")]
+public class ChatController(Kernel kernel) : ControllerBase
+{
+    private const string Prompt =
+        """
+        <message role="system">You are friendly assistant.</message>
+        <message role="user">{{$userMessage}}</message>
+        """;
+
+    private readonly Kernel _kernel = kernel;
+
+    [HttpPost]
+    public async Task<IActionResult> PostAsync(ChatModel chat)
+    {
+        var arguments = new KernelArguments
+        {
+            ["userMessage"] = chat.Message,
+            ["documents"] = chat.Documents
+        };
+
+        return this.Ok((await this._kernel.InvokePromptAsync(Prompt, arguments)).ToString());
+    }
+}