added basic readme

Author: phshafi

README.md

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+## This repo is intended to make it easy to get introduced with nodejs API testing.
+
+### What we are using
+
+-  [**Jest**](https://github.com/jestjs/jest) as test runner and assertion library. 
+-  [**Supertest**](https://github.com/ladjs/supertest#readme)  for testing node.js HTTP server