Update README.md

Author: prabaprakash

README.md

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 # Hackerrank-JS-Solutions
 Solved entire easy problems & few medium problems in data structures category
 
+<img src="https://user-images.githubusercontent.com/3902309/88914103-bd7d3380-d27f-11ea-92d4-939d3d58bbc0.jpg" alt="one step at a time" align="center" width="60%" height="50%" />
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 # Contributor
 Contributors always welcome