Add team collaboration setup instructions to README

Provides steps for environment owners and team members to share and join existing Azure resources using azd. This addition helps streamline onboarding and collaboration without creating duplicate resources.

Author: CWade3051

README.md

@@ -17,6 +17,46 @@ urlFragment: azure-search-openai-demo
 ---
 -->
 
+## 🤝 Team Collaboration Setup
+
+**To work with existing Azure resources instead of creating new ones:**
+
+### For the Environment Owner (Person who ran `azd up`):
+1. Export your environment configuration:
+   ```bash
+   azd env get-values > .env.shared
+   ```
+2. Share the `.env.shared` file with your teammates
+3. Also share your environment name: `azd env list`
+
+### For Team Members (Joining existing environment):
+1. Clone this repository:
+   ```bash
+   git clone https://github.com/walmart-acquisition-tech/azure-search-openai-demo.git
+   cd azure-search-openai-demo
+   ```
+
+2. Import the shared environment:
+   ```bash
+   azd env new 'env name' --subscription <subscription-id-from-shared-file>
+   azd env set --env-file .env.shared
+   ```
+
+3. Verify connection to existing resources:
+   ```bash
+   azd show
+   ```
+
+4. Run locally to test:
+   ```bash
+   cd app
+   ./start.sh
+   ```
+
+**Note:** This connects you to the same Azure resources - no need to run `azd up` again!
+
+---
+
 # RAG chat app with Azure OpenAI and Azure AI Search (Python)
 
 This solution creates a ChatGPT-like frontend experience over your own documents using RAG (Retrieval Augmented Generation). It uses Azure OpenAI Service to access GPT models, and Azure AI Search for data indexing and retrieval.