docs: Add summary and reference docs for Storage Control API to readme (#2485)

* docs: Add summary and reference docs for Storage Control API to readme

* add readme-partials change

* add link without modifying template

* remove newline

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: sydney-munro

.readme-partials.yaml

@@ -1,4 +1,10 @@
 custom_content: |
+  ## About Storage Control
+  
+  The [Storage Control API](https://cloud.google.com/storage/docs/reference/rpc/) lets you perform metadata-specific, control plane, and long-running operations.
+  
+  The Storage Control API creates one space to perform metadata-specific, control plane, and long-running operations apart from the Storage API. Separating these operations from the Storage API improves API standardization and lets you run faster releases.
+  
   #### Creating an authorized service object
 
   To make authenticated requests to Google Cloud Storage, you must create a service object with credentials. You can

README.md

@@ -99,6 +99,12 @@ See the [Cloud Storage client library docs][javadocs] to learn how to
 use this Cloud Storage Client Library.
 
 
+## About Storage Control
+
+The [Storage Control API](https://cloud.google.com/storage/docs/reference/rpc/) lets you perform metadata-specific, control plane, and long-running operations.
+
+The Storage Control API creates one space to perform metadata-specific, control plane, and long-running operations apart from the Storage API. Separating these operations from the Storage API improves API standardization and lets you run faster releases.
+
 #### Creating an authorized service object
 
 To make authenticated requests to Google Cloud Storage, you must create a service object with credentials. You can