Add link to switch in JS Roadmap (#3380)

src/roadmaps/javascript/content/107-javascript-control-flow/101-conditional-statements/101-switch.md

@@ -24,4 +24,5 @@ switch (expression) {
 Visit the following resources to learn more:
 
 - [switch - MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/switch)
+- [The `switch` Statement: Why, What and How - CodeGuage](https://www.codeguage.com/courses/js/conditions-switch)
 - [The switch statement - javascript.info](https://javascript.info/switch)