Add do...while statement in JavaScript roadmap (#1820)

* Update 104-do-while-statement.md

* Update content/roadmaps/106-javascript/content/106-javascript-loops-iterations/104-do-while-statement.md

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

content/roadmaps/106-javascript/content/106-javascript-loops-iterations/104-do-while-statement.md

@@ -1 +1,7 @@
-# Do while statement
+# do...while statement
+
+The `do...while` statement creates a loop that executes a specified statement until the test condition evaluates to `false`. The condition is evaluated after executing the statement, resulting in the specified statement executing at least once. 
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/do...while'>do...while - MDN</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.w3schools.com/jsref/jsref_dowhile.asp'>JavaScript do...while Loop - W3Schools</BadgeLink>