ci: Add appveyor.yml

Enforce CRLF line endings so Windows users can actually edit using
notepad.

Build buildbot.xml ReleaseAll target with both VS2013 and VS2015.

Create 7zipped build similar to what the buildbot makes.

appveyor.yml

@@ -0,0 +1,35 @@
+# Static build version - changing the version dynamically means you can't
+# just click from github to see how things are progressing until the build has
+# finished, which could be a bit annoying.
+version: 1.{build}-{branch}
+
+environment:
+  matrix:
+  - platform: Win32
+    target: ReleaseAll
+    visualstudio_string: vs2015
+  - platform: Win32
+    VisualStudioVersion: 12.0
+    target: ReleaseAll
+    visualstudio_string: vs2013
+
+init:
+# Use CRLF line endings on Windows so users can just use Notepad.
+  - git config --global core.autocrlf true
+
+build_script:
+  - msbuild buildbot.xml /m /t:%target% /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
+
+after_build:
+  - ps: $env:gitrev = git describe --tags
+  - ps: $env:my_version = "$env:gitrev-$env:appveyor_repo_branch-$env:appveyor_build_number"
+  - type NUL > bin\portable.ini
+  - set folder_name=pcsx2-%my_version%-%visualstudio_string%-%platform%-%target%
+  - rename bin %folder_name%
+  - 7z a -mx9 %folder_name%.7z %folder_name%
+
+test: off
+
+artifacts:
+  - path: $(folder_name).7z
+    name: $(visualstudio_string)-$(target)