Set up CI with Azure Pipelines

[skip ci]

azure-pipelines.yml

@@ -0,0 +1,27 @@
+# Xamarin.Android
+# Build a Xamarin.Android project.
+# Add steps that test, sign, and distribute an app, save build artifacts, and more:
+# https://docs.microsoft.com/azure/devops/pipelines/languages/xamarin
+
+trigger:
+- master
+
+pool:
+  vmImage: 'macos-latest'
+
+variables:
+  buildConfiguration: 'Release'
+  outputDirectory: '$(build.binariesDirectory)/$(buildConfiguration)'
+
+steps:
+- task: NuGetToolInstaller@0
+
+- task: NuGetCommand@2
+  inputs:
+    restoreSolution: '**/*.sln'
+
+- task: XamarinAndroid@1
+  inputs:
+    projectFile: '**/*droid*.csproj'
+    outputDirectory: '$(outputDirectory)'
+    configuration: '$(buildConfiguration)'