Test Windows build with Appveyor

MANIFEST.SKIP

@@ -0,0 +1,2 @@
+^appveyor\.yml$
+^MANIFEST\.SKIP$

Makefile.PL

@@ -8,6 +8,8 @@ use warnings;
 use 5.008;
 use ExtUtils::MakeMaker;
 
+$ExtUtils::MakeMaker::Verbose = 1;
+
 use Devel::CheckLib;
 {
 local @ARGV = @ARGV;

appveyor.yml

@@ -0,0 +1,32 @@
+environment:
+  CMARK_VERSION: 0.25.2
+
+install:
+  - perl -MConfig -e "print \"lib_ext: \", $Config{lib_ext}, \"\\n\""
+  - path C:\MinGW\bin;C:\Perl\site\bin;C:\Perl\bin;C:\Windows\System32;C:\Program Files\7-Zip;C:\Program Files (x86)\CMake\bin;C:\Program Files\AppVeyor\BuildAgent
+
+  # Install libcmark.
+  - if not exist C:\projects\sources mkdir C:\projects\sources
+  - cd C:\projects\sources
+  - appveyor DownloadFile https://github.com/jgm/cmark/archive/%CMARK_VERSION%.zip -FileName cmark.zip
+  - 7z x cmark.zip
+  - cd cmark-%CMARK_VERSION%
+  - mkdir build
+  - cd build
+  - cmake .. -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=C:\projects\cmark
+  - mingw32-make install
+
+  # Install Perl prereqs
+  - cd C:\projects\perl-commonmark
+  - ppm install dmake
+  - ppm install Devel-CheckLib
+
+build_script:
+  - perl Makefile.PL INC=-IC:\projects\cmark\include LIBS="-LC:\projects\cmark\bin -lcmark"
+  - dmake
+
+test_script:
+  - dmake test
+
+clone_depth: 5
+