First attempt at appveyor config.

appveyor.yml

@@ -0,0 +1,21 @@
+environment:
+  CMAKE_ARGS: ""
+
+install:
+  - appveyor DownloadFile http://slproweb.com/download/Win32OpenSSL-1_0_2.exe
+  - Win32OpenSSL-1_0_2.exe /silent /verysilent /sp- /suppressmsgboxes
+  - appveyor DownloadFile ftp://sourceware.org/pub/pthreads-win32/pthreads-w32-2-9-1-release.zip
+  - md C:\pthreads
+  - 7z e pthreads-w32-2-9-1-release.zip C:\pthreads
+
+build:
+
+build_script:
+  - md build
+  - cd build
+  - cmake %CMAKE_ARGS% ..
+
+cache:
+  - C:\OpenSSL-Win32
+  - C:\pthreads
+