Update readme.md

Author: sebavan

readme.md

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 Babylon.js exporters
 ====================
 
+[![Build Status](https://dev.azure.com/babylonjs/ContinousIntegration/_apis/build/status/Exporters%20CI?branchName=master)](https://dev.azure.com/babylonjs/ContinousIntegration/_build/latest?definitionId=3&branchName=master)
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 Documentation for all exporters is available here: http://doc.babylonjs.com/exporters
 
 **Any questions?** Here is our official [forum](https://forum.babylonjs.com/).