AppVeyor: Try to clone submodules, and add badge

- Add an `install` step that tries to update our submodules (just `glslang` at the moment)

- Try to add a "badge" image to the main `README.md`

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index 66c753bb0..49c4506d5 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Slang
 
+![AppVeyor build status](https://ci.appveyor.com/api/projects/status/kt9ch5niwkslk5p4/branch/master?svg=true)
+
 Slang is a library for compiling real-time shader code.
 It can be used with either existing HLSL or GLSL code, or with code written directly in Slang.
 The library provides a variety of services that application developers can use to put together the shader compilation workflow they want.