Add information about local scope (#4420)

javascript-roadmap-scope-variable-local scope description added
fixes : #4388

src/data/roadmaps/javascript/content/101-javascript-variables/103-scopes/index.md

@@ -10,6 +10,8 @@ Function Scope: Variables declared within a function can only be used within tha
 
 Block Scope: A block is any part of JavaScript code bounded by '{}'. Variables declared within a block can not be accessed outside that block. This Scope is only provided by the `let` and `const` keywords. If you declare a variable within a block using the `var` keyword, it will NOT have Block Scope.
 
+Local Scope: Local variables are only recognized inside their functions, variables with the same name can be used in different functions. Local variables are created when a function starts, and deleted when the function is completed. `var`, `let` and `const` all provide this Scope.
+
 Visit the following resources to learn more:
 
 - [JavaScript Scope](https://www.w3schools.com/js/js_scope.asp)