Init azure pipeline (#133)

azure.yml

+#Multi-configuration and multi-agent job options are not exported to YAML. Configure these options using documentation guidance: https://docs.microsoft.com/vsts/pipelines/process/phases
+
+queue:
+  name: Hosted Linux Preview
+
+variables:
+  python.version: '3.5, 3.6, >= 3.7.0a'
+
+steps:
+
+- task: UsePythonVersion@0
+  displayName: 'Use Python $(python.version)'
+  inputs:
+    versionSpec: '$(python.version)'
+
+- script: 'python -m pip install --upgrade pip'
+  displayName: 'Install dependencies'
+
+- script: 'pip install flake8 && flake8'
+  displayName: Flake8
+  enabled: false
+  continueOnError: true