update readme

README.md

@@ -2,10 +2,16 @@
 
 An alternative to `boost::variant` for C++11.
 
+[![Build Status](https://secure.travis-ci.org/mapbox/variant.svg)](https://travis-ci.org/mapbox/variant)
+
+[![Build status](https://ci.appveyor.com/api/projects/status/eqddcfxlvmt6fkif)](https://ci.appveyor.com/project/springmeyer/variant)
+
 # Depends
 
  - Compiler supporting `-std=c++11`
- - Tested with g++-4.7, g++-4.8, and clang++ 3.4
+ - Tested with g++-4.7, g++-4.8, and clang++ 3.4, Visual C++ Compiler November 2013 CTP
+
+Note: get the VS "CTP" release at http://www.microsoft.com/en-us/download/details.aspx?id=41151
 
 # Usage
 
@@ -18,15 +24,19 @@ The tests depend on:
  - Boost headers (for benchmarking against `boost::variant`)
  - Boost built with `--with-timer` (used for benchmark timing)
 
-Set your boost includes and libs locations and run `make test`:
+On Unix systems set your boost includes and libs locations and run `make test`:
 
     export LDFLAGS='-L/opt/boost/lib'
     export CXXFLAGS='-I/opt/boost/include'
     make test
 
+On windows do:
+
+    vcbuild
+
 ## Benchmark
 
-Run the benchmark like:
+On Unix systems run the benchmark like:
 
     make bench