Add info about identifiers names restricctions

Author: AleCentalz

JavaScript_Basics/variables.js

@@ -2,10 +2,18 @@
 
 // There is only 3 types of variables in javascript
 
-let a = "Swapnil"; // New type introduced in ES6. Value of let can change any time.
+let userNickname = "Swapnil"; // New type introduced in ES6. Value of let can change any time.
 
-a = "Swap76";
+userNickname = "Swap76";
 
-const pi = 3.14;// New type introduced in ES6. Value of pi now cannot be changed as this is defined as const.
+const PI = 3.14;// New type introduced in ES6. Value of pi now cannot be changed as this is defined as const.
 
-var b = 26;// This is Deprecated as this creates many problems in future.
+var day26 = 26;// This is Deprecated as this creates many problems in future.
+
+
+
+//Tips: *use significatives variables names, example: 
+//	let a = "User's name" for let userNickName = "User's name"
+//*CammelCase for a better understaning, JS has case sensitive.
+//*Variables names must begin with a letter.
+//*write constants with Upper case.