.NET: Add FM Playground example applications in Amazon Bedrock (#5578)

Add FM Playground example applications for Amazon Bedrock

---------

Co-authored-by: François Bouteruche <[email protected]>
Co-authored-by: Laren-AWS <[email protected]>
Co-authored-by: Brian Murray <[email protected]>

.doc_gen/cross-content/cross_FMPlayground_NetV3_block.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "file://zonbook/docbookx.dtd" [
+  <!ENTITY % phrases-shared SYSTEM "file://AWSShared/common/phrases-shared.ent">
+  %phrases-shared;
+]>
+<block>
+  <para>
+	  .NET Foundation Model (FM) Playground is a .NET MAUI Blazor sample application that showcases how to use &BRlong; from C# code. 
+	  This example shows how .NET and C# developers can use &BR; 
+	  to build generative AI-enabled applications. You can test and interact with &BR; foundation models by using the following four playgrounds:
+  </para>
+  <itemizedlist>
+    <listitem>
+      <para>A text playground.</para>
+    </listitem>
+    <listitem>
+      <para>A chat playground.</para>
+    </listitem>
+    <listitem>
+      <para>A voice chat playground.</para>
+    </listitem>
+    <listitem>
+      <para>An image playground.</para>
+    </listitem>
+  </itemizedlist>
+  <para>The example also lists and displays the foundation models you have access to and their characteristics. For source code and deployment
+    instructions, see the project in <ulink url="https://github.com/build-on-aws/dotnet-fm-playground">GitHub</ulink>.
+  </para>
+</block>

.doc_gen/metadata/cross_metadata.yaml

@@ -694,3 +694,17 @@ cross_ResilientService:
       DescribeLoadBalancers, CreateTargetGroup, DescribeTargetGroups, DeleteTargetGroup,
       CreateLoadBalancer, CreateListener, DeleteLoadBalancer, DescribeTargetHealth}
     iam: {CreateInstanceProfile, DeleteInstanceProfile}
+cross_FMPlayground:
+  title: Create a sample application that offers playgrounds to interact with &BR; foundation models using an &AWS; SDK
+  title_abbrev: Create a playground application to interact with &BR; foundation models
+  synopsis: create playgrounds to interact with &BR; foundation models through different modalities.
+  category: Scenarios
+  languages:
+    .NET:
+      versions:
+        - sdk_version: 3
+          block_content: cross_FMPlayground_NetV3_block.xml
+  service_main: bedrock-runtime
+  services:
+    bedrock-runtime:
+