Add appveyor files

Author: Leont

.appveyor.cmd

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+@echo off
+
+if not defined perl_type set perl_type=system
+if "%perl_type%" == "strawberry" (
+  if not defined perl_version (
+    cinst -y StrawberryPerl
+  ) else (
+    cinst -y StrawberryPerl --version %perl_version%
+  )
+  set "PATH=C:\Strawberry\perl\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\c\bin;%PATH%"
+) else if "%perl_type%" == "system" (
+  mkdir c:\dmake
+  cinst -y curl
+  curl http://www.cpan.org/authors/id/S/SH/SHAY/dmake-4.12.2.2.zip -o c:\dmake\dmake.zip
+  7z x c:\dmake\dmake.zip -oc:\ >NUL
+  set "PATH=c:\dmake;C:\MinGW\bin;%PATH%"
+) else (
+  echo.Unknown perl type "%perl_type%"! 1>&2
+  exit /b 1
+)
+for /f "usebackq delims=" %%d in (`perl -MConfig -e"print $Config{make}"`) do set make=%%d
+set "perl=perl"
+set TAR_OPTIONS=--warning=no-unknown-keyword
+
+:eof

.appveyor.yml

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+version: '{build}'
+shallow_clone: true
+
+environment:
+  matrix:
+    - perl_type: system
+    - perl_type: strawberry
+    - perl_type: strawberry
+      perl_version: 5.12.3.1
+    - perl_type: strawberry
+      perl_version: 5.16.3.3
+    - perl_type: strawberry
+      perl_version: 5.20.1.1
+
+install:
+  - 'call .appveyor.cmd perl_setup'
+  - 'cpan ExtUtils::PL2Bat'
+  - '%perl% -V'
+
+build: off
+
+test_script:
+  - 'prove -l t'
+