Add Azure Pipelines badge

Author: devlead

README.md

@@ -19,7 +19,7 @@ Notation) strings.
 | Bitrise                     | MacOS         | [![Build Status](https://app.bitrise.io/app/5975a00ca2666fb1/status.svg?token=OZnv4YWRw71IVax38Wi50Q&branch=develop)](https://app.bitrise.io/app/5975a00ca2666fb1) |
 | Bitrise                     | Linux         | [![Build Status](https://app.bitrise.io/app/4c9ee62c6ba13630/status.svg?token=RBH8UKw-68lQYjageT8VoQ&branch=develop)](https://app.bitrise.io/app/4c9ee62c6ba13630)|
 | Travis                      | Linux / MacOS | [![Travis build status](https://travis-ci.org/LitJSON/litjson.svg?branch=develop)](https://travis-ci.org/LitJSON/litjson)                                      |
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+| Azure Pipelines             | Linux / MacOS / Windows | [![Azure Pipelines Build Status](https://dev.azure.com/LitJSON/litjson/_apis/build/status/LitJSON.litjson?branchName=develop)](https://dev.azure.com/LitJSON/litjson/_build/latest?definitionId=3&branchName=develop) |
 
 ## Compiling