.NET v4 preview: adding example folders for Bedrock

dotnetv4/Bedrock-runtime/.gitignore

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+/.vs/
+/Tools/

dotnetv4/Bedrock-runtime/Actions/BedrockRuntimeActions.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AWSSDK.BedrockRuntime" Version="4.0.0-preview.4" />
+  </ItemGroup>
+
+</Project>

dotnetv4/Bedrock-runtime/Actions/HelloBedrockRuntime.cs

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+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+namespace BedrockRuntimeActions
+{
+    internal class HelloBedrockRuntime
+    {
+        private static readonly string CLAUDE = "anthropic.claude-v2";
+
+        static async Task Main(string[] args)
+        {
+            await TextToText();
+        }
+
+        private static async Task TextToText()
+        {
+            string prompt = "In one sentence, what is a large-language model?";
+            await Invoke(CLAUDE, prompt);
+        }
+
+        private static async Task Invoke(string modelId, string prompt)
+        {
+            switch (modelId)
+            {
+                case var _ when modelId == CLAUDE:
+                    Console.WriteLine(await InvokeModelAsync.InvokeClaudeAsync(prompt));
+                    break;
+                default:
+                    Console.WriteLine($"Unknown model ID: {modelId}. Valid model IDs are: {CLAUDE}.");
+                    break;
+            };
+        }
+    }
+}