Jenkins build status badge added

README.md

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 <a href='https://opensource.org/licenses/Apache-2.0'><img src='https://img.shields.io/badge/License-Apache%202.0-blue.svg'></a><br/>
 
-[![pipeline status](https://gitlab.com/entgra/carbon-device-mgt/badges/master/pipeline.svg)](https://gitlab.com/entgra/carbon-device-mgt/commits/master)
+<a href='#'><img src="https://storage.googleapis.com/cdn-entgra/build-status/device-mgt-core/icon.svg"></a>