Update Deployment Guide with installation steps

Added instructions for running installation command and handling prompts.

Author: Shreyas-Microsoft

docs/DeploymentGuide.md

@@ -127,8 +127,19 @@ Select one of the following options to deploy the Modernize Your Code Solution A
 3. Select the subscription where you want to deploy the solution
 4. Wait for the environment to initialize (includes all deployment tools)
 5. When prompted in the VS Code Web terminal, choose one of the available options shown
-
-6. Proceed to [Step 3: Configure Deployment Settings](#step-3-configure-deployment-settings)
+6. Once the solution opens, the **AI Foundry terminal** will automatically start running the following command to install the required dependencies:
+
+    ```shell
+    sh install.sh
+    ```
+    During this process, you’ll be prompted with the message:
+    ```
+    What would you like to do with these files?
+    - Overwrite with versions from template
+    - Keep my existing files unchanged
+    ```
+
+7. Proceed to [Step 3: Configure Deployment Settings](#step-3-configure-deployment-settings)
 
 </details>