Update README.md

Author: rahul11gupta

README.md

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 # Data Structures and Algorithms in Javascript
-This repository contains popular data structures and algorithms implemented in Javascript.
+This repository contains popular data structures and algorithms implemented in Javascript. Also included is a test file with every problem statement to verify whether it passes the testcases.  
+  
+Each data-structure and algorithm will also contain a readme file to explain the necessary concepts as well as the approach to be followed for solving the problem. At the end, the space and time complexities will also be mentioned for the solution.  
+  
+🎉 If you are a beginner Javascript developer I hope you will learn a lot from this repository. If you are an experiencied developer I hope you could find something useful.  
+  
+All contributions to this repository is welcomed with ❤️