add initial appveyor config file

.travis.yml

@@ -1,5 +0,0 @@
-language: c
-script: make
-
-notifications:
-  irc: "irc.freenode.org#msfnotify"

README.md

@@ -1,6 +1,8 @@
 metasploit-payloads >
 =====================
 
+Appveyor build status: [![Build Status](https://ci.appveyor.com/api/projects/status/github/rapid7/metasploit-payloads)](https://ci.appveyor.com/project/appveyor-r7/metasploit-payloads)
+
 This is a unified repository for different Metasploit Framework payloads, which merges these repositories:
 
  * [C Windows/Linux Meterpreters][csource]

appveyor.yml

@@ -0,0 +1,16 @@
+environment:
+  PATH: C:\msys64\usr\bin;C:\msys64\mingw64\bin;C:\Windows\System32;C:\Windows;%PATH%
+
+  matrix:
+    - GENERATOR: Visual Studio 12 2013
+      CONFIG: Release
+      SHARED_LIBS: ON
+
+before_build:
+  - cd c/meterpreter
+
+build_script:
+  # - call "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64
+  - git submodule update -i
+  - call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x86_amd64
+  - make.bat