Added AppVeyor build status to README.md.
diff --git a/README.md b/README.md
index 723a863..d338685 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,5 @@
 **License:** MIT. See [LICENSE.txt](LICENSE.txt).
 
 **Changelog:** See [CHANGELOG.md](CHANGELOG.md).
+
+**Build status:** [![Build status](https://ci.appveyor.com/api/projects/status/4vlcrb0emkaio2pn/branch/master?svg=true)](https://ci.appveyor.com/project/adam-sawicki-amd/vulkanmemoryallocator/branch/master)