Add Azure pipelines build status badge to the readme (#904)

Author: SamCarlberg

README.md

@@ -1,6 +1,7 @@
 ![logo](https://cloud.githubusercontent.com/assets/3964980/11156885/6fa1967a-8a1c-11e5-8c78-e552ffba31c0.png)
 
 [![Join the chat at https://gitter.im/WPIRoboticsProjects/GRIP](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/WPIRoboticsProjects/GRIP?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Build Status](https://dev.azure.com/wpiroboticsprojects/GRIP/_apis/build/status/WPIRoboticsProjects.GRIP?branchName=master)](https://dev.azure.com/wpiroboticsprojects/GRIP/_build/latest?definitionId=1?branchName=master)
 [![Build Status](https://travis-ci.org/WPIRoboticsProjects/GRIP.svg?branch=master)](https://travis-ci.org/WPIRoboticsProjects/GRIP)
 [![Build status](https://ci.appveyor.com/api/projects/status/sbrd2nhpiktlhf58/branch/master?svg=true)](https://ci.appveyor.com/project/JLLeitschuh/grip/branch/master)
 [![codecov.io](http://codecov.io/github/WPIRoboticsProjects/GRIP/coverage.svg?branch=master)](http://codecov.io/github/WPIRoboticsProjects/GRIP?branch=master)