VOL-2020 re-release to get proper version tag; add go.mod file

Change-Id: I97af22349c731d953ec8e5cc7db2c3a38fce9fc7
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..8fb2ecc
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,10 @@
+module github.com/opencord/voltha-protos
+
+go 1.12
+
+require (
+	github.com/golang/protobuf v1.3.1
+	golang.org/x/net v0.0.0-20190311183353-d8887717615a // indirect
+	google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8
+	google.golang.org/grpc v1.17.0
+)