docs: adds a new post-deployment guide for users who have deployed using the AVM template (#1936)

Author: Harsh-Microsoft

docs/AVMPostDeploymentGuide.md

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+# AVM Post Deployment Guide
+
+> **📋 Note**: This guide is specifically for post-deployment steps after using the AVM template. For complete deployment from scratch, see the main [deployment guide](../README.md).
+
+---
+
+This document provides guidance on post-deployment steps after deploying the Chat with your data - Solution accelerator from the [AVM (Azure Verified Modules) repository](https://github.com/Azure/bicep-registry-modules/tree/main/avm/ptn/sa/chat-with-your-data).
+
+## Pre-requisites
+
+Ensure you have a **Deployed Infrastructure** - A successful Chat with your data - Solution accelerator deployment from the [AVM repository](https://github.com/Azure/bicep-registry-modules/tree/main/avm/ptn/sa/chat-with-your-data)
+
+## Post Deployment Steps
+
+### Step 1: Configure App Authentication
+
+1. After deployment is complete, navigate to your Azure App Service in the Azure portal
+2. Follow the detailed instructions in [Set Up Authentication in Azure App Service](./azure_app_service_auth_setup.md) to add authentication to your web app
+3. This will ensure only authorized users can access your application
+
+### Step 2: Access and Configure the Admin Site
+
+1. **Navigate to the admin site** using the following URL pattern:
+   ```
+   https://web-{unique-token}-admin.azurewebsites.net/
+   ```
+
+2. **Upload your documents**:
+   - Select **Ingest Data** from the admin interface
+   - Upload your documents using the drag-and-drop interface
+   - For testing purposes, you can use the sample data located in the `/data` directory of this repository
+
+   ![Admin site interface](./images/admin-site.png)
+
+3. **Monitor the ingestion process**:
+   - Wait for the documents to be processed and indexed
+   - Verify successful ingestion through the admin interface
+
+### Step 3: Access the Chat Application
+
+1. **Navigate to the main chat application** using this URL pattern:
+   ```
+   https://web-{unique-token}.azurewebsites.net/
+   ```
+
+2. **Test the chat functionality**:
+   - Start a conversation by asking questions about your uploaded documents
+   - Verify that the AI responds with relevant information from your data
+
+   ![Chat application interface](./images/web-unstructureddata.png)
+
+## Next Steps
+
+Consider these additional configurations for enhanced functionality:
+
+- 📚 **[Advanced Image Processing](./advanced_image_processing.md)** - Enable enhanced document processing
+- 🔄 **[Integrated Vectorization](./integrated_vectorization.md)** - Configure advanced AI search features
+- 💬 **[Conversation Flow Options](./conversation_flow_options.md)** - Customize the chat experience
+- 🎤 **[Speech-to-Text](./speech_to_text.md)** - Add voice interaction capabilities