.Net: Add getting started showing how to use hooks for responsible AI (…

…microsoft#4273)

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### Description

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### Contribution Checklist

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- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
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raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

dotnet/samples/KernelSyntaxExamples/Getting_Started/Step5_Chat_Prompt.cs

@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Threading.Tasks;
+using Microsoft.SemanticKernel;
+
+public static class Step5_Chat_Prompt
+{
+    /// <summary>
+    /// Show how to construct a chat prompt and invoke it.
+    /// </summary>
+    public static async Task RunAsync()
+    {
+        // Create a kernel with OpenAI chat completion
+        Kernel kernel = Kernel.CreateBuilder()
+            .AddOpenAIChatCompletion(
+                modelId: TestConfiguration.OpenAI.ChatModelId,
+                apiKey: TestConfiguration.OpenAI.ApiKey)
+            .Build();
+
+        // Invoke the kernel with a chat prompt and display the result
+        string chatPrompt = @"
+            <message role=""user"">What is Seattle?</message>
+            <message role=""system"">Respond with JSON.</message>
+        ";
+        Console.WriteLine(await kernel.InvokePromptAsync(chatPrompt));
+    }
+}

dotnet/samples/KernelSyntaxExamples/Getting_Started/Step6_Responsible_AI.cs

@@ -0,0 +1,46 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Threading.Tasks;
+using Microsoft.SemanticKernel;
+
+// This example shows how to use rendering event hooks to ensure that prompts are rendered in a responsible manner.
+public static class Step6_Responsible_AI
+{
+    /// <summary>
+    /// Show how to use rendering event hooks to ensure that prompts are rendered in a responsible manner.
+    /// </summary>
+    public static async Task RunAsync()
+    {
+        // Create a kernel with OpenAI chat completion
+        Kernel kernel = Kernel.CreateBuilder()
+            .AddOpenAIChatCompletion(
+                modelId: TestConfiguration.OpenAI.ChatModelId,
+                apiKey: TestConfiguration.OpenAI.ApiKey)
+            .Build();
+
+        // Handler which is called before a prompt is rendered
+        void MyRenderingHandler(object? sender, PromptRenderingEventArgs e)
+        {
+            if (e.Arguments.ContainsName("card_number"))
+            {
+                e.Arguments["card_number"] = "**** **** **** ****";
+            }
+        }
+
+        // Handler which is called after a prompt is rendered
+        void MyRenderedHandler(object? sender, PromptRenderedEventArgs e)
+        {
+            e.RenderedPrompt += " NO SEXISM, RACISM OR OTHER BIAS/BIGOTRY";
+
+            Console.WriteLine(e.RenderedPrompt);
+        }
+
+        // Add the handlers to the kernel
+        kernel.PromptRendering += MyRenderingHandler;
+        kernel.PromptRendered += MyRenderedHandler;
+
+        KernelArguments arguments = new() { { "card_number", "4444 3333 2222 1111" } };
+        Console.WriteLine(await kernel.InvokePromptAsync("Tell me some useful information about this credit card number {{$card_number}}?", arguments));
+    }
+}

dotnet/samples/KernelSyntaxExamples/Getting_Started/Step5_Pipelining.cs → dotnet/samples/KernelSyntaxExamples/Getting_Started/Step7_Pipelining.cs

@@ -10,7 +10,7 @@
 using Microsoft.Extensions.Logging;
 using Microsoft.SemanticKernel;
 
-public static class Step5_Pipelining
+public static class Step7_Pipelining
 {
     /// <summary>
     /// Provides an example of combining multiple functions into a single function that invokes