chore: import upstream snapshot with attribution

dotnet/samples/Concepts/Functions/MethodFunctions.cs

@@ -0,0 +1,24 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.SemanticKernel.Plugins.Core;
+
+namespace Functions;
+
+public class MethodFunctions(ITestOutputHelper output) : BaseTest(output)
+{
+    [Fact]
+    public Task RunAsync()
+    {
+        Console.WriteLine("======== Functions ========");
+
+        // Load native plugin
+        var text = new TextPlugin();
+
+        // Use function without kernel
+        var result = text.Uppercase("ciao!");
+
+        Console.WriteLine(result);
+
+        return Task.CompletedTask;
+    }
+}