Set up CI with Azure Pipelines

Author: azure-pipelines[bot]

azure-pipelines.yml

@@ -0,0 +1,25 @@
+trigger:
+- master
+- maint/*
+
+variables:
+  solution: '**/*.sln'
+  buildPlatform: 'Any CPU'
+  buildConfiguration: 'Release'
+
+jobs:
+- job: Windows
+  pool:
+    vmImage: 'VS2017-Win2016'
+  steps:
+  - script: buildandtest.cmd
+- job: Linux
+  pool:
+    vmImage: 'Ubuntu 16.04'
+  steps:
+  - script: ./buildandtest.sh
+- job: macOS
+  pool:
+    vmImage: 'macOS 10.13'
+  steps:
+  - script: ./buildandtest.sh