Add Travis CI badge to README

Change-Id: I352dbee34ba17d6526eb305add548e0eb3b953f5
diff --git a/README.md b/README.md
index 455be28..6b31067 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 NFD - Named Data Networking Forwarding Daemon
 =============================================
 
+[![Build Status](https://travis-ci.org/named-data/NFD.svg?branch=master)](https://travis-ci.org/named-data/NFD)
+
 For complete documentation, including step-by-step installation instructions and
 tutorials, please visit the [NFD homepage](http://named-data.net/doc/NFD/).