added AppVeyor-configuration

appveyor.yml

@@ -0,0 +1,28 @@
+## thanks to https://dzone.com/articles/continuous-integration-windows
+## with some adjustments and exported yaml-settings
+
+version: '{build}'
+os: Windows Server 2012
+pull_requests:
+  do_not_increment_build_number: true
+branches:
+  only:
+  - master
+skip_tags: true
+
+build_script:
+  - gradlew.bat assemble --info --no-daemon
+
+test_script:
+  - gradlew.bat check --info --no-daemon
+
+cache:
+  - C:\Users\appveyor\.gradle
+
+environment:
+  matrix:
+  - JAVA_HOME: C:\Program Files\Java\jdk1.8.0
+  - JAVA_HOME: C:\Program Files (x86)\Java\jdk1.8.0
+
+matrix:
+  fast_finish: true