VOL-2020 move voltha.pb and add placeholder go file

Change-Id: I6f882f951ac89a3d8f60eaaf7dc5f7c5eb91fb4c
diff --git a/protoset.go b/protoset.go
new file mode 100644
index 0000000..2ab256d
--- /dev/null
+++ b/protoset.go
@@ -0,0 +1,22 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.
+ */
+
+/*
+ * Import this file into a go project in order to cause `go mod vendor`
+ * to vendor the voltha.pb file.
+ */
+
+package volthaGoProtoSet;