Add JS Article Return

JS-Return.md

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+# JavaScript Return
+
+## Introduction
+
+When a **return** statement is called in a function, the execution of this function is stopped. If specified, a given value is returned to the function caller. If the expression is omitted, `undefined` is returned instead.
+
+```javascript
+return [[expression]];
+```
+
+[MDN link](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/return) | [MSDN link](https://msdn.microsoft.com/en-us/library/22a685h9.aspx)
+
+## Examples
+
+The following function returns the square of its argument, **x**, where **x** is a number.
+
+```javascript
+function square(x) {
+   return x * x;
+}
+```
+
+The following function returns the product of its arguments, **arg1** and **arg2**.
+
+```javascript
+function myfunction(arg1, arg2){
+   var r;
+   r = arg1 * arg2;
+   return(r);
+}
+```