Add README.md for customer service sample with setup and usage instructions

Author: AnatoliB

samples-v2/openai_agents/customer_service/README.md

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+# Customer Service Sample
+
+This sample demonstrates a customer service agent built with Azure Durable Functions and OpenAI Agents. The agent can handle airline-related queries including FAQ lookups and seat booking.
+
+## Running the Sample
+
+**For complete setup instructions, configuration details, and troubleshooting, see the [Getting Started Guide](/docs/openai_agents/getting-started.md).**
+
+### Step 1: Start the Azure Functions App
+
+From the OpenAI Agents samples root directory (`/samples-v2/openai_agents`), start the Azure Functions host:
+
+```bash
+func start
+```
+
+The function app will start and listen on `http://localhost:7071` by default.
+
+### Step 2: Start the Interactive Client
+
+In a separate terminal, navigate to the `customer_service` directory and run the client:
+
+```bash
+cd customer_service
+python customer_service_client.py
+```
+
+If your function app is running on a different host or port, you can specify a custom URL:
+
+```bash
+python customer_service_client.py --start-url http://<app host URL>/api/orchestrators/customer_service
+```
+
+The client will:
+
+1. Start a new orchestration instance
+2. Wait for prompts from the agent
+3. Allow you to interact with the customer service agent interactively
+
+## Usage
+
+Once the client is running, you can:
+
+- Ask FAQ questions (e.g., "What's the baggage policy?", "Is there wifi?")
+- Request seat changes (the agent will guide you through the process)
+- Type `exit`, `quit`, or `bye` to end the conversation