Update: add readme.md file

Author: Mar-Issah

0x06-unittests_in_js/README.md

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+## Learning Objectives
+
+- How to use Mocha to write a test suite
+- How to use different assertion libraries (Node or Chai)
+- How to present long test suites
+- When and how to use spies
+- When and how to use stubs
+- What are hooks and when to use them
+- Unit testing with Async functions
+- How to write integration tests with a small node server