Appveyor is a CI server running on windows. Similar to the travis
configuration a yaml based configuration is needed.

Change-Id: Ia4572dad2ee434fb0756721a0b6052897f4f6aaa
Resolves: #75328
Releases: master
Reviewed-on: https://review.typo3.org/47450


Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>