Python: Added examples with explicit settings (#562)

* Added examples with explicit settings

* Added info about RBAC roles

python/samples/getting_started/agents/openai_chat_client/README.md

@@ -7,6 +7,7 @@ This folder contains examples demonstrating different ways to create and use age
 | File | Description |
 |------|-------------|
 | [`openai_chat_client_basic.py`](openai_chat_client_basic.py) | The simplest way to create an agent using `ChatClientAgent` with `OpenAIChatClient`. Shows both streaming and non-streaming responses for chat-based interactions with OpenAI models. |
+| [`openai_chat_client_with_explicit_settings.py`](openai_chat_client_with_explicit_settings.py) | Shows how to initialize an agent with a specific chat client, configuring settings explicitly including API key and model ID. |
 | [`openai_chat_client_with_function_tools.py`](openai_chat_client_with_function_tools.py) | Demonstrates how to use function tools with agents. Shows both agent-level tools (defined when creating the agent) and query-level tools (provided with specific queries). |
 | [`openai_chat_client_with_local_mcp.py`](openai_chat_client_with_local_mcp.py) | Shows how to integrate OpenAI agents with local Model Context Protocol (MCP) servers for enhanced functionality and tool integration. |
 | [`openai_chat_client_with_thread.py`](openai_chat_client_with_thread.py) | Demonstrates thread management with OpenAI agents, including automatic thread creation for stateless conversations and explicit thread management for maintaining conversation context across multiple interactions. |

python/samples/getting_started/agents/openai_chat_client/openai_chat_client_with_explicit_settings.py

@@ -0,0 +1,36 @@
+# Copyright (c) Microsoft. All rights reserved.
+
+import asyncio
+import os
+from random import randint
+from typing import Annotated
+
+from agent_framework.openai import OpenAIChatClient
+from pydantic import Field
+
+
+def get_weather(
+    location: Annotated[str, Field(description="The location to get the weather for.")],
+) -> str:
+    """Get the weather for a given location."""
+    conditions = ["sunny", "cloudy", "rainy", "stormy"]
+    return f"The weather in {location} is {conditions[randint(0, 3)]} with a high of {randint(10, 30)}°C."
+
+
+async def main() -> None:
+    print("=== OpenAI Chat Client with Explicit Settings ===")
+
+    agent = OpenAIChatClient(
+        ai_model_id=os.environ["OPENAI_CHAT_MODEL_ID"],
+        api_key=os.environ["OPENAI_API_KEY"],
+    ).create_agent(
+        instructions="You are a helpful weather agent.",
+        tools=get_weather,
+    )
+
+    result = await agent.run("What's the weather like in New York?")
+    print(f"Result: {result}\n")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())