Update README hello world example (#1075)

README.md

@@ -28,8 +28,9 @@ Welcome to Microsoft's comprehensive multi-language framework for building, orch
 Python
 
 ```bash
-# This will install all sub-packages, see `python/packages` for individual packages
-pip install agent-framework
+pip install agent-framework --prerelease=allow
+# This will install all sub-packages, see `python/packages` for individual packages.
+# It may take a minute on first install on Windows.
 ```
 
 .NET
@@ -87,20 +88,27 @@ dotnet add package Microsoft.Agents.AI
 Create a simple Azure Responses Agent that writes a haiku about the Microsoft Agent Framework
 
 ```python
-# pip install agent-framework
+# pip install agent-framework --prerelease=allow
 # Use `az login` to authenticate with Azure CLI
 import asyncio
 from agent_framework.azure import AzureOpenAIResponsesClient
 from azure.identity import AzureCliCredential
 
-async def main():
-  # Initialize a chat agent with basic instructions
-  agent = AzureOpenAIResponsesClient(credential=AzureCliCredential()).create_agent(
-    name="HaikuBot",
-    instructions="You are an upbeat assistant that writes beautifully.",
-  )
 
-  print(await agent.run("Write a haiku about Microsoft Agent Framework."))
+async def main():
+    # Initialize a chat agent with Azure OpenAI Responses
+    agent = AzureOpenAIResponsesClient(
+        endpoint="https://your-custom-endpoint.openai.azure.com/",
+        deployment_name="gpt-5",
+        api_version="2025-03-01-preview",
+        credential=AzureCliCredential(),
+    ).create_agent(
+        name="HaikuBot",
+        instructions="You are an upbeat assistant that writes beautifully.",
+    )
+
+    print(await agent.run("Write a haiku about Microsoft Agent Framework."))
+
 
 asyncio.run(main())
 ```