kc3-lang/sys_wait

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+[![Build status](https://ci.appveyor.com/api/projects/status/y90h99r4gkq9x8ii?svg=true)](https://ci.appveyor.com/project/SSE4/sys-wait-h)
+
 header-only Windows implementation of the `<sys/wait.h>` header.
 
 tested on the following compilers: