chore: import upstream snapshot with attribution

docs/en/documentation/getting-started/quickstart/shared/cloud_setup.md

@@ -0,0 +1,17 @@
+<!-- This file has been used in local_quickstart.md, local_quickstart_go.md & local_quickstart_js.md -->
+<!-- [START cloud_setup] -->
+If you plan to use **Google Cloud’s Vertex AI** with your agent (e.g., using
+`vertexai=True` or a Google GenAI model), follow these one-time setup steps for
+local development:
+
+1. [Install the Google Cloud CLI](https://cloud.google.com/sdk/docs/install)
+1. [Set up Application Default Credentials
+   (ADC)](https://cloud.google.com/docs/authentication/set-up-adc-local-dev-environment)
+1. Set your project and enable Vertex AI
+
+    ```bash
+    gcloud config set project YOUR_PROJECT_ID
+    gcloud services enable aiplatform.googleapis.com
+    ```
+
+<!-- [END cloud_setup] -->