Add while statement in JavaScript roadmap (#1819)

* Update 105-while-statement.md

* Update content/roadmaps/106-javascript/content/106-javascript-loops-iterations/105-while-statement.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/106-javascript/content/106-javascript-loops-iterations/105-while-statement.md

@@ -1 +1,6 @@
-# While statement
+# while statement
+
+The `while` statement creates a loop that executes a specified statement as long as the test condition evaluates to `true`. The condition is evaluated before executing the statement. 
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/while'>While Statement - MDN</BadgeLink>