Added a new resource (#64)

Hey, I have added a new resource on JavaScript variables. I came upon this article while looking for resources to learn JS. This citation, in my opinion, will enhance the content of this article. Hope that my contribution will benefit other learners.

Author: Sandeep Mishra

01 Javascript Advance/Day2/README.md

@@ -185,5 +185,7 @@ function nameFunction() {
 In JS, lifetime of variable starts when it is declared and local variables are deleted when the function is completed.
 In a web browser, global variables are deleted when you close the browser window.
 
+Learn more about JavaScript variables [here](https://www.scaler.com/topics/javascript/javascript-variables/).
+
 for more info about this topic view [link1](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get)
 and [link2](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/set)