Add a badge for AppVeyor build.
Change-Id: Ic59d78d699af0e5f50377f83c8a7ea9a78074d81
diff --git a/README.md b/README.md
index 981647f..51377ad 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
Protocol Buffers - Google's data interchange format
===================================================
-[](https://travis-ci.org/google/protobuf)
+[](https://travis-ci.org/google/protobuf) [](https://ci.appveyor.com/project/protobuf/protobuf)
Copyright 2008 Google Inc.