Set up CI with Azure Pipelines [skip ci]

azure-pipelines.yml

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+# Starter pipeline
+# Start with a minimal pipeline that you can customize to build and deploy your code.
+# Add steps that build, run tests, deploy, and more:
+# https://aka.ms/yaml
+
+jobs:
+  - job: Build_PS_Win2016
+    pool:
+      vmImage: vs2017-win2016
+    steps:
+    - powershell: |
+        .\build.ps1 -Verbose
+      displayName: 'Build and Test'
+    - task: PublishTestResults@2
+      inputs:
+        testRunner: 'NUnit'
+        testResultsFiles: '**/TestResults.xml'
+        testRunTitle: 'PS_Win2016'
+      displayName: 'Publish Test Results'
+ 
+  - job: Build_PSCore_Ubuntu1604
+ 
+    pool:
+      vmImage: ubuntu-16.04
+ 
+    steps:
+    - script: |
+        curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
+        curl https://packages.microsoft.com/config/ubuntu/16.04/prod.list | sudo tee /etc/apt/sources.list.d/microsoft.list
+        sudo apt-get update
+        sudo apt-get install -y powershell
+      displayName: 'Install PowerShell Core'
+ 
+    - script: |
+        pwsh -c '.\build.ps1'
+      displayName: 'Build and Test'
+ 
+    - task: PublishTestResults@2
+      inputs:
+        testRunner: 'NUnit'
+        testResultsFiles: '**/TestResults.xml'
+        testRunTitle: 'PSCore_Ubuntu1604'
+      displayName: 'Publish Test Results'
+ 
+  - job: Build_PSCore_MacOS1013
+    pool:
+      vmImage: xcode9-macos10.13
+    steps:
+    - script: |
+        brew update
+        brew tap caskroom/cask
+        brew cask install powershell
+      displayName: 'Install PowerShell Core'
+ 
+    - script: |
+        pwsh -c '.\build.ps1'
+      displayName: 'Build and Test'
+ 
+    - task: PublishTestResults@2
+      inputs:
+        testRunner: 'NUnit'
+        testResultsFiles: '**/TestResults.xml'
+        testRunTitle: 'PSCore_MacOS1013'
+      displayName: 'Publish Test Results'