Set up CI with Azure Pipelines (jamesyonan#5)

* Set up CI with Azure Pipelines

[skip ci]

* Update pipeline to install brenda. Update README

README.md

@@ -104,7 +104,7 @@ Tutorial (basic use)
 
 ### First steps
 
-This tutorial is intended for use on macOS or Linux, and Python 2 is required.
+This tutorial is intended for use on macOS or Linux, and Python 3 is required.
 
 If you don't have an AWS (Amazon Web Services) account, sign up
 for one now.
@@ -113,8 +113,8 @@ Next, download and install Brenda on the client machine.
 
     $ git clone http://github.com/msmith93/brenda.git
     $ cd brenda
-    $ pip3 install -r requirements.txt
-    $ pip3 install .
+    $ pip install -r requirements.txt
+    $ pip install .
 
 ### EC2 key pair setup
 

azure-pipelines.yml

@@ -0,0 +1,39 @@
+# Python package
+# Create and test a Python package on multiple Python versions.
+# Add steps that analyze code, save the dist with the build record, publish to a PyPI-compatible index, and more:
+# https://docs.microsoft.com/azure/devops/pipelines/languages/python
+
+trigger:
+  branches:
+   include:
+     - "*"
+
+pool:
+  vmImage: 'ubuntu-latest'
+strategy:
+  matrix:
+    Python27:
+      python.version: '2.7'
+    Python35:
+      python.version: '3.5'
+    Python36:
+      python.version: '3.6'
+    Python37:
+      python.version: '3.7'
+
+steps:
+- task: UsePythonVersion@0
+  inputs:
+    versionSpec: '$(python.version)'
+  displayName: 'Use Python $(python.version)'
+
+- script: |
+    python -m pip install --upgrade pip
+    pip install -r requirements.txt
+    pip install .
+  displayName: 'Install dependencies'
+
+- script: |
+    pip install pytest pytest-azurepipelines
+    echo "Running pytest"
+  displayName: 'pytest'