Add protobuf
diff --git a/third_party/golang/protobuf/README.google b/third_party/golang/protobuf/README.google
new file mode 100644
index 0000000..3b155bb
--- /dev/null
+++ b/third_party/golang/protobuf/README.google
@@ -0,0 +1,4 @@
+Protobuf is the set of official tools for handling protobufs
+in Go.
+
+URL: https://github.com/golang/protobuf.git