Update README.md to include auth login fix for github codespaces users (#1856)

* Update README.md to include auth login fix for github codespaces users

* Update README.md

* Update README.md

---------

Co-authored-by: Pamela Fox <[email protected]>
Co-authored-by: Pamela Fox <[email protected]>

Author: GiuseppeGalilei

README.md

@@ -134,6 +134,11 @@ Follow these steps to provision Azure resources and deploy the application code:
     azd auth login
     ```
 
+    For GitHub Codespaces users, if the previous command fails, try: 
+   ```shell
+    azd auth login --use-device-code 
+    ```
+
 1. Create a new azd environment:
 
     ```shell