Add README.md

Author: Maryanne Gichohi

examples/Python/ai-agent-sample-app/README.md

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+# Azure App Configuration - AI Agent chat application
+
+This sample demonstrates using Azure App Configuration to load agent YAML specifications that define AI agent behavior, prompts, and model configurations for a chat application.
+
+## Features
+
+- Integrates with Azure AI Agent Framework to create a conversational AI agent
+- Loads agent YAML specifications from Azure App Configuration.
+
+## Prerequisites
+
+- Python 3.8 or later
+- An Azure subscription with access to:
+  - Azure App Configuration service
+  - Microsoft Foundry project
+- Required environment variables:
+  - `AZURE_APPCONFIGURATION_ENDPOINT`: Endpoint URL of your Azure App Configuration instance
+
+## Setup
+
+1. Clone the repository
+1. Install the required packages:
+
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+1. Configure your Azure App Configuration store with the agent YAML specification:
+
+   ```yaml
+    kind: Prompt
+    name: WeatherAgent
+    description: Weather Agent
+    instructions: You are a helpful assistant.
+    model:
+        id: gpt-4.1
+        connection:
+            kind: remote
+   ```
+
+1. Configure your Azure App Configuration store with project endpoint:
+
+    ```console
+    Agent:ProjectEndpoint - Your Foundry project endpoint
+    ```
+
+1. Set the required environment variables:
+
+   ```bash
+   export AZURE_APPCONFIGURATION_ENDPOINT="https://your-appconfig.azconfig.io"
+   ```
+
+## Running the Application
+
+Start the console application:
+
+```bash
+python app.py
+```