Added azure-pipelines check

azure-pipelines.yml

+trigger:
+- master
+
+pool:
+  vmImage: 'ubuntu-18.04'
+
+steps:
+- task: UsePythonVersion@0
+  inputs:
+    versionSpec: '3.6'
+
+- script: python -m pip install --upgrade pip setuptools wheel
+  displayName: Install tools
+
+- script: pip install pydocstyle flake8
+  displayName: Install dependencies
+
+- script: flake8 .
+  displayName: Run flake8 checks
+
+- script: pydocstyle .
+  displayName: Verify docstings