docs: fix missing local step (closes #213)

Author: sinedied

README.md

@@ -244,6 +244,7 @@ You can only run locally **after** having successfully run the `azd up` command.
 2. Run `azd env get-values > .env` to get the environment variables for the app
 3. Run `az login`
 4. Run `npm start` or run the "VS Code Task: Start App" to start the project locally.
+5. Run `./scripts/index-data.sh` or `./scripts/index-data.ps1` to index the data locally.
 
 ## Using the app