update readme look

Author: ashishgopalhattimare

README.md

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   <img src="https://github.com/ashishgopalhattimare/Parallel-Concurrent-and-Distributed-Programming-in-Java/blob/master/certificate/NDV8ZGXD45BP.png" width="50%">
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 <p align="center"> <i>Parallel Concurrent and Distributed Programming in Java | Coursera Certification</i> </p>
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 <b>LEGENDS LABELLING</b> </br>