Add appveyor, for CI on Windows

.gitattributes

@@ -4,6 +4,7 @@
 /.gitattributes export-ignore
 /.gitignore export-ignore
 /.travis.yml export-ignore
+/appveyor.yml export-ignore
 /makefile export-ignore
 /phpunit.xml.dist export-ignore
 /README.md export-ignore

appveyor.yml

@@ -0,0 +1,28 @@
+build: false
+
+shallow_clone: false
+
+platform:
+  - x86
+  - x64
+
+cache:
+  - C:\Program Files\OpenSSL -> appveyor.yml
+  - C:\tools\php -> appveyor.yml
+  - vendor -> composer.json
+
+init:
+  - SET PATH=C:\Program Files\OpenSSL;C:\tools\php;%PATH%
+
+install:
+  # install ssl
+  - IF NOT EXIST "C:\Program Files\OpenSSL" (cinst -y OpenSSL.Light)
+  # install php
+  - IF NOT EXIST C:\tools\php (cinst -y php)
+  - echo extension_dir=ext > C:\tools\php\php.ini
+  - echo extension=php_openssl.dll >> C:\tools\php\php.ini
+  # install composer
+  - IF NOT EXIST vendor (php -r "readfile('https://getcomposer.org/installer');" | php & php composer.phar --prefer-source install)
+
+test_script:
+  - vendor\bin\phpunit