chore(storagetransfer): carve out sub-module (#4519)

This commit will be tagged v0.91.1 and storagetransfer/v0.1.0.

internal/generated/snippets/go.mod

@@ -23,14 +23,17 @@ replace cloud.google.com/go/spanner => ../../../spanner
 replace cloud.google.com/go/storage => ../../../storage
 
 require (
-	cloud.google.com/go v0.90.0
+	cloud.google.com/go v0.91.1
 	cloud.google.com/go/bigquery v0.90.0
 	cloud.google.com/go/datastore v0.90.0
 	cloud.google.com/go/firestore v0.90.0
 	cloud.google.com/go/logging v0.90.0
 	cloud.google.com/go/pubsub v1.9.1
 	cloud.google.com/go/pubsublite v0.90.0
 	cloud.google.com/go/spanner v0.90.0
+	cloud.google.com/go/storagetransfer v0.0.0-00010101000000-000000000000
 	google.golang.org/api v0.52.0
 	google.golang.org/genproto v0.0.0-20210811021853-ddbe55d93216
 )
+
+replace cloud.google.com/go/storagetransfer => ../../../storagetransfer

storagetransfer/CHANGES.md

@@ -0,0 +1,6 @@
+# Changes
+
+## v0.1.0
+
+This is the first tag to carve out storagetransfer as its own module. See
+[Add a module to a multi-module repository](https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository).

storagetransfer/README.md

@@ -0,0 +1,40 @@
+# Storage Transfer API
+
+[![Go Reference](https://pkg.go.dev/badge/cloud.google.com/go/storagetransfer.svg)](https://pkg.go.dev/cloud.google.com/go/storagetransfer)
+
+Go Client Library for Storage Transfer API.
+
+## Install
+
+```bash
+go get cloud.google.com/go/storagetransfer
+```
+
+## Stability
+
+The stability of this module is indicated by SemVer.
+
+However, a `v1+` module may have breaking changes in two scenarios:
+
+* Packages with `alpha` or `beta` in the import path
+* The GoDoc has an explicit stability disclaimer (for example, for an experimental feature).
+
+## Go Version Support
+
+See the [Go Versions Supported](https://github.com/googleapis/google-cloud-go#go-versions-supported)
+section in the root directory's README.
+
+## Authorization
+
+See the [Authorization](https://github.com/googleapis/google-cloud-go#authorization)
+section in the root directory's README.
+
+## Contributing
+
+Contributions are welcome. Please, see the [CONTRIBUTING](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/CONTRIBUTING.md)
+document for details.
+
+Please note that this project is released with a Contributor Code of Conduct.
+By participating in this project you agree to abide by its terms. See
+[Contributor Code of Conduct](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/CONTRIBUTING.md#contributor-code-of-conduct)
+for more information.

storagetransfer/go.mod

@@ -0,0 +1,12 @@
+module cloud.google.com/go/storagetransfer
+
+go 1.16
+
+require (
+	cloud.google.com/go v0.91.1
+	github.com/googleapis/gax-go/v2 v2.0.5
+	google.golang.org/api v0.52.0
+	google.golang.org/genproto v0.0.0-20210811021853-ddbe55d93216
+	google.golang.org/grpc v1.39.1
+	google.golang.org/protobuf v1.27.1
+)