Update azure-pipelines.yml for Azure Pipelines

Author: nohinthomas

azure-pipelines.yml

@@ -35,3 +35,10 @@ steps:
     pip install pytest pytest-azurepipelines
     pytest
   displayName: 'pytest'
+
+- task: PublishCodeCoverageResults@1
+  inputs:
+    codeCoverageTool: "JaCoCo"
+    summaryFileLocation: "$(System.DefaultWorkingDirectory)/**/site/jacoco/jacoco.xml"
+    reportDirectory: "$(System.DefaultWorkingDirectory)/**/site/jacoco"
+    failIfCoverageEmpty: true