Set up CI with Azure Pipelines (#48)

Doing this so I can setup a Release pipeline that pushes to NuGet.

* JAVA_HOME_8_X64 workaround

azure-pipelines.yml

@@ -0,0 +1,23 @@
+# https://aka.ms/yaml
+
+name: $(BuildID)
+
+trigger:
+- master
+
+jobs:
+- job: windows
+  pool:
+    name: Hosted Windows 2019 with VS2019
+    demands:
+    - msbuild
+  steps:
+  - powershell: |
+      ./build.ps1 -t AppVeyor
+    displayName: build
+  - task: PublishPipelineArtifact@0
+    displayName: artifacts
+    inputs:
+      artifactName: artifacts
+      targetPath: build
+    condition: succeededOrFailed()

helpers.cake

@@ -50,6 +50,13 @@ MSBuildSettings MSBuildSettings()
 
         Information("Building using MSBuild at " + msBuildPath);
         settings.ToolPath = msBuildPath;
+
+        var java_home = Environment.GetEnvironmentVariable("JAVA_HOME_8_X64");
+        if (!string.IsNullOrEmpty(java_home))
+        {
+            Information("JAVA_HOME_8_X64 set: " + java_home);
+            settings = settings.WithProperty("JavaSdkDirectory", java_home);
+        }
     }
     else
     {