appveyor: Initial configuration

.appveyor.yml

@@ -0,0 +1,20 @@
+image: Visual Studio 2015
+build: off
+
+before_build:
+  - git submodule update --init --recursive --depth 1
+  - git clone https://github.com/FWGS/hlsdk-portable --depth 1
+  - git clone https://github.com/FWGS/xash3d-android-project -b android-legacy --depth 1
+  - curl -fsS -o android-ndk-r10e-windows-x86_64.zip https://dl.google.com/android/repository/android-ndk-r10e-windows-x86_64.zip
+  - 7z x android-ndk-r10e-windows-x86_64.zip
+
+build_script:
+  - set ANDROID_NDK_HOME=%APPVEYOR_BUILD_FOLDER%/android-ndk-r10e
+  - set HOST_TOOLCHAIN=windows-x86_64
+  - python waf configure --enable-android-legacy --android aarch64,4.9,21
+  - type build/config.log
+  - python waf
+
+on_failure:
+  - appveyor PushArtifact build/config.log
+  - type build/config.log