docs: add note about Google Ads llibrary (#814)

Author: mik-laj

README.md

@@ -10,9 +10,11 @@ These client libraries are officially supported by Google.  However, the librari
 
 See the [docs folder](docs/README.md) for more detailed instructions and additional documentation.
 
-## Google Cloud Platform
+## Google Cloud Platform / Google Ads
 
-For Google Cloud Platform APIs such as Datastore, Cloud Storage or Pub/Sub, we recommend using [Cloud Client Libraries for Python](https://github.com/GoogleCloudPlatform/google-cloud-python) which is under active development.
+For Google Cloud Platform APIs such as Datastore, Cloud Storage or Pub/Sub, we recommend using [Cloud Client Libraries for Python](https://github.com/GoogleCloudPlatform/google-cloud-python).
+
+For Google Ads API, we recommend using [Google Ads API Client Library for Python](https://github.com/googleads/google-ads-python/).
 
 ## Installation