Create usageAndStudyGuide.md

Author: sadanandpai

usageAndStudyGuide.md

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+### Usage Guide for this repo
+
+- The JavaScript modern interview code challenges are divided into 5 sections topic wise
+- These sections are mututally exclusive for most of the questions and _no ordering_ has to be followed for topics
+- Each section will have list of questions generally from easy to advanced level with _increasing difficulty_
+- All the questions are listed at the top of each section and clicking on the question will land to the answer section
+- Questions might have example which helps to understand the question better
+- Questions might have multiple solutions or answers divided in to multiple parts
+- Notes contain additional details about the solution
+- _Try to solve the questions on your own before looking in to the solutions_
+
+---
+
+### Recommended study materials on JavaScript
+
+##### Books 
+- https://eloquentjavascript.net/
+- https://github.com/getify/You-Dont-Know-JS
+- https://www.manning.com/books/secrets-of-the-javascript-ninja-second-edition
+
+##### Tutorials and references
+- https://developer.mozilla.org/en-US/docs/Web/JavaScript
+- https://javascript.info/
+- https://tc39.es/ecma262/