initial samples (openai#489)

* initial samples

* added global.json to force .NET 10 usage in this folder

* updated readme

* added link

* changes s3 to use system message

* changed folder structure

* moved readme

Author: KrzysztofCwalina

docs/guides/README.MD

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+# OpenAI Documentation Examples for .NET
+
+## Running the Samples
+
+The samples use a new .NET 10 feature that allows [running single C# file applications](https://devblogs.microsoft.com/dotnet/announcing-dotnet-run-app/). Each file in this folder is a standalone application. 
+
+To run them, you need to install the .NET 10 preview. 
+
+Then, from the command line, you can run them using the `dotnet run <sample_name>` command, for example: `dotnet run s1-chat_simpleprompt.cs`.
+

docs/guides/global.json

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+{
+  "sdk": {
+    "version": "10.*-preview"
+  }
+}

docs/guides/text/chat/chat_instructions.cs

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+// SAMPLE: Generate text with messages using different roles
+#:package OpenAI@2.2.*-*
+#:property PublishAot=false
+
+using OpenAI.Chat; 
+
+string key = Environment.GetEnvironmentVariable("OPENAI_KEY")!;
+ChatClient client = new("gpt-4.1", key);
+ChatCompletion acompletion = client.CompleteChat([
+    ChatMessage.CreateSystemMessage("Talk like a pirate."),
+    ChatMessage.CreateUserMessage("Are semicolons optional in JavaScript?")
+]);
+Console.WriteLine(acompletion.Content[0].Text);

docs/guides/text/chat/chat_roles.cs

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+// SAMPLE: Generate text with messages using different roles
+#:package OpenAI@2.2.*-*
+#:property PublishAot=false
+
+using OpenAI.Chat; 
+
+string key = Environment.GetEnvironmentVariable("OPENAI_KEY")!;
+ChatClient client = new("gpt-4.1", key);
+ChatCompletion acompletion = client.CompleteChat([
+    ChatMessage.CreateDeveloperMessage("Talk like a pirate."),
+    ChatMessage.CreateUserMessage("Are semicolons optional in JavaScript?")
+]);
+Console.WriteLine(acompletion.Content[0].Text);

docs/guides/text/chat/chat_simpleprompt.cs

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+// SAMPLE: Generate text from a simple prompt
+#:package OpenAI@2.2.*-*
+#:property PublishAot=false
+
+using OpenAI.Chat; 
+
+string key = Environment.GetEnvironmentVariable("OPENAI_KEY")!;
+ChatClient client = new("gpt-4.1", key);
+ChatCompletion acompletion = client.CompleteChat("Write a one-sentence bedtime story about a unicorn.");
+Console.WriteLine(acompletion.Content[0].Text);

docs/guides/text/responses/responses_fileinput.cs

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+// SAMPLE: Prompt template with file input variable
+#:package OpenAI@2.2.*-*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+using OpenAI.Files;
+using System.ClientModel;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_KEY")!;
+OpenAIResponseClient client = new("gpt-4.1", key);
+
+// Upload a PDF we will reference in the variables
+OpenAIFileClient files = new(key);
+OpenAIFile file = files.UploadFile("draconomicon.pdf", FileUploadPurpose.UserData);
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse(
+    BinaryContent.Create(BinaryData.FromObjectAsJson(
+    new {
+        model = "gpt-4.1",
+        prompt = new {
+            id = "pmpt_abc123",
+            variables = new {
+                topic = "Dragons",
+                reference_pdf = new {
+                    type = "input_file",
+                    file_id = file.Id,
+                }
+            }
+        }
+    }
+)));
+Console.WriteLine(response.GetOutputText());

docs/guides/text/responses/responses_instructions.cs

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+// SAMPLE: Generate text with instructions
+#:package OpenAI@2.2.*-*
+#:property PublishAot=false
+
+using OpenAI.Responses; 
+
+string key = Environment.GetEnvironmentVariable("OPENAI_KEY")!;
+OpenAIResponseClient client = new("gpt-4.1", key);
+OpenAIResponse response = client.CreateResponse(
+    "Are semicolons optional in JavaScript?",
+    new() { Instructions = "Talk like a pirate." }
+);
+
+
+Console.WriteLine(response.GetOutputText());

docs/guides/text/responses/responses_prompttemplate.cs

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+// SAMPLE: Generate text with a prompt template
+#:package OpenAI@2.2.*-*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+using System.ClientModel;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_KEY")!;
+OpenAIResponseClient client = new("gpt-4.1", key);
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse(
+    BinaryContent.Create(BinaryData.FromObjectAsJson(
+    new {
+        model = "gpt-4.1",
+        prompt = new {
+            id = "pmpt_abc123",
+            version = "2",
+            variables = new {
+                customer_name = "Jane Doe",
+                product = "40oz juice box"
+            }
+        }
+    }
+)));
+Console.WriteLine(response.GetOutputText());

docs/guides/text/responses/responses_roles.cs

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+// SAMPLE: Generate text with messages using different roles
+#:package OpenAI@2.2.*-*
+#:property PublishAot=false
+
+using OpenAI.Responses; 
+
+string key = Environment.GetEnvironmentVariable("OPENAI_KEY")!;
+OpenAIResponseClient client = new("gpt-4.1", key);
+OpenAIResponse response = client.CreateResponse([
+    ResponseItem.CreateDeveloperMessageItem("Talk like a pirate."),
+    ResponseItem.CreateUserMessageItem("Are semicolons optional in JavaScript?")
+]);
+
+
+Console.WriteLine(response.GetOutputText());

docs/guides/text/responses/responses_simpleprompt.cs

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+// SAMPLE: Generate text from a simple prompt
+#:package OpenAI@2.2.*-*
+#:property PublishAot=false
+
+using OpenAI.Responses; 
+
+string key = Environment.GetEnvironmentVariable("OPENAI_KEY")!;
+OpenAIResponseClient client = new("gpt-4.1", key);
+OpenAIResponse response = client.CreateResponse("Write a one-sentence bedtime story about a unicorn.");
+Console.WriteLine(response.GetOutputText());