Add Carthage badge to readme

Ben Chatelain · Ben Chatelain · commit 3d5c74c40f76 · 2015-03-23T18:33:15.000-06:00
diff --git a/README.md b/README.md
@@ -1,5 +1,7 @@
 # ObjectiveGit
 
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+
 ObjectiveGit provides Cocoa bindings to the
 [libgit2](https://github.com/libgit2/libgit2) library.
 
