Added new JavaScript questions and solutions to README

Author: Jenesh18

README.md

@@ -519,7 +519,6 @@
 | 469 | [What is globalThis, and what is the importance of it?](#what-is-globalthis-and-what-is-the-importance-of-it) |
 | 470 | [What are the array mutation methods?](#what-are-the-array-mutation-methods) |
 | 471 | [What is module scope in JavaScript?](#what-is-module-scope-in-JavaScript) |
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@@ -8992,7 +8991,6 @@ The `globalThis` property provides a standard way of accessing the global object
 
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 ### Coding Exercise
 
 #### 1. What is the output of below code