chore(pubsublite): carve out module
diff --git a/pubsublite/CHANGES.md b/pubsublite/CHANGES.md
new file mode 100644
index 0000000..68ca673
--- /dev/null
+++ b/pubsublite/CHANGES.md
@@ -0,0 +1,6 @@
+# Changes
+
+## v0.1.0
+
+This is the first tag to carve out pubsublite as its own module. See:
+https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository.
diff --git a/pubsublite/go.mod b/pubsublite/go.mod
new file mode 100644
index 0000000..7635fe6
--- /dev/null
+++ b/pubsublite/go.mod
@@ -0,0 +1,3 @@
+module cloud.google.com/go/pubsublite
+
+go 1.15
diff --git a/pubsublite/go_mod_tidy_hack.go b/pubsublite/go_mod_tidy_hack.go
new file mode 100644
index 0000000..ef20748
--- /dev/null
+++ b/pubsublite/go_mod_tidy_hack.go
@@ -0,0 +1,22 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file, and the cloud.google.com/go import, won't actually become part of
+// the resultant binary.
+// +build modhack
+
+package pubsublite
+
+// Necessary for safely adding multi-module repo. See: https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository
+import _ "cloud.google.com/go"
