Add code samples for the quickstart page

docs/global.json

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

docs/quickstart/responses/analyze_images_files_file_url.cs

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+// SAMPLE: Analyzes file from a file URL through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart?input-type=file-url#analyze-images-and-files
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Files;
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+using HttpClient http = new();
+using Stream stream = await http.GetStreamAsync("https://www.berkshirehathaway.com/letters/2024ltr.pdf");
+OpenAIFileClient files = new(key);
+OpenAIFile file = files.UploadFile(stream, "2024ltr.pdf", FileUploadPurpose.UserData);
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("Analyze the letter and provide a summary of the key points."),
+        ResponseContentPart.CreateInputFilePart(file.Id)
+    ])
+]);
+
+Console.WriteLine(response.GetOutputText());

docs/quickstart/responses/analyze_images_files_image_url.cs

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+// SAMPLE: Analyzes image from an image URL through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart?input-type=image-url#analyze-images-and-files
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("What is in this image?"),
+        ResponseContentPart.CreateInputImagePart(new Uri("https://openai-documentation.vercel.app/images/cat_and_otter.png"))
+    ])
+]);
+
+Console.WriteLine(response.GetOutputText());

docs/quickstart/responses/analyze_images_files_upload_file.cs

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+// SAMPLE: Analyzes file from a file upload through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart?input-type=file-upload#analyze-images-and-files
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Files;
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+OpenAIFileClient files = new(key);
+OpenAIFile file = files.UploadFile("draconomicon.pdf", FileUploadPurpose.UserData);
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputFilePart(file.Id),
+        ResponseContentPart.CreateInputTextPart("What is the first dragon in the book?")
+    ])
+]);
+
+Console.WriteLine(response.GetOutputText());

docs/quickstart/responses/developer_quickstart.cs

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+// SAMPLE: Generate text from a simple prompt through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+OpenAIResponse response = client.CreateResponse("Write a one-sentence bedtime story about a unicorn.");
+
+Console.WriteLine(response.GetOutputText());

docs/quickstart/responses/extend_model_with_tools_file_search.cs

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+// SAMPLE: Get information from file search through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart?tool-type=file-search#extend-the-model-with-tools
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateFileSearchTool([ "<vector_store_id>" ]));
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("What is deep research by OpenAI?")
+    ])
+], options);
+
+Console.WriteLine(response.GetOutputText());

docs/quickstart/responses/extend_model_with_tools_function_calling.cs

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+// SAMPLE: Generate response from function calling through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart?tool-type=function-calling#extend-the-model-with-tools
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using System.Text.Json;
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateFunctionTool(
+        functionName: "get_weather",
+        functionDescription: "Get current temperature for a given location.",
+        functionParameters: BinaryData.FromObjectAsJson(new
+        {
+            type = "object",
+            properties = new
+            {
+                location = new
+                {
+                    type = "string",
+                    description = "City and country e.g. Bogotá, Colombia",
+                }
+            },
+            required = new[] { "location" },
+            additionalProperties = false
+        }),
+        strictModeEnabled: true
+    )
+);
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("What is the weather like in Paris today?")
+    ])
+], options);
+
+Console.WriteLine(JsonSerializer.Serialize(response.OutputItems[0]));

docs/quickstart/responses/extend_model_with_tools_remote_mcp.cs

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+// SAMPLE: Generate response from remote MCP through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart?tool-type=remote-mcp#extend-the-model-with-tools
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateMcpTool(
+    serverLabel: "dmcp",
+    serverUri: new Uri("https://dmcp-server.deno.dev/sse"),
+    toolCallApprovalPolicy: new McpToolCallApprovalPolicy(GlobalMcpToolCallApprovalPolicy.NeverRequireApproval)
+));
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("Roll 2d4+1")
+    ])
+], options);
+
+Console.WriteLine(response.GetOutputText());

docs/quickstart/responses/extend_model_with_tools_web_search.cs

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+// SAMPLE: Get information from web search through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart?tool-type=web-search#extend-the-model-with-tools
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+ResponseCreationOptions options = new();
+options.Tools.Add(ResponseTool.CreateWebSearchTool());
+
+OpenAIResponse response = (OpenAIResponse)client.CreateResponse([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("What was a positive news story from today?")
+    ])
+], options);
+
+Console.WriteLine(response.GetOutputText());

docs/quickstart/responses/stream_responses_build_realtime_apps.cs

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+// SAMPLE: Generate streaming response for realtime apps through Responses API
+// PAGE: https://platform.openai.com/docs/quickstart#stream-responses-and-build-realtime-apps
+// GUIDANCE: Instructions to run this code: https://aka.ms/oai/net/start
+#pragma warning disable OPENAI001
+
+#:package System.Linq.Async@6.*
+#:package OpenAI@2.*
+#:property PublishAot=false
+
+using OpenAI.Responses;
+
+string key = Environment.GetEnvironmentVariable("OPENAI_API_KEY")!;
+OpenAIResponseClient client = new(model: "gpt-5", apiKey: key);
+
+var responses = client.CreateResponseStreamingAsync([
+    ResponseItem.CreateUserMessageItem([
+        ResponseContentPart.CreateInputTextPart("Say 'double bubble bath' ten times fast.")
+    ])
+]);
+
+await foreach (var response in responses)
+{
+    if (response is StreamingResponseOutputTextDeltaUpdate delta)
+    {
+        Console.Write(delta.Delta);
+    }
+}