[No longer maintained, Azure DevOps Test Connector (64 bit) is now live on VS 2022]
Azure DevOps Test Connector
Allows you to seamlessly synchronise Test Cases and SpecFlow Feature Files in Visual Studio, with Test Plans/Suites & Cases in Azure DevOps. Also automatically adds the association between ADO and Visual Studio, massively speeding up the existing process in Visual Studio. Now with support for creating multiple test cases from Specflow Scenario Outlines.
Fill out the Azure DevOps Test Connector options in Tools > Options then when you're ready, right click on a test class file that you want entered/sync'd to Azure DevOps, and click "Sync Azure DevOps Test Cases"