Add Appyveyor configuration

appveyor.yml

@@ -0,0 +1,20 @@
+version: "{branch} {build}"
+
+build:
+  verbosity: detailed
+
+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
+
+matrix:
+  fast_finish: true