Update README.md

Added Binarysearch website, a coding platform. It is one among the platform that has strong test cases.
Harmeet25 · Mar 30, 2021 · 0c598a4 · 0c598a4
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 * ### [HackerEarth](https://www.hackerearth.com/challenges/)
 * ### [DailyCodingProblem](https://www.dailycodingproblem.com)
 * ### [UrionlineJudge](https://www.urionlinejudge.com.br/judge/en/login)
+* ### [Binarysearch](https://binarysearch.com/)
 
 
 ## Problem Solving Books: