Added new resource for variable naming rules (#2919)

This resource gives some very useful variable naming tips for JavaScript.

content/roadmaps/106-javascript/content/101-javascript-variables/102-naming-rules.md

@@ -3,6 +3,7 @@
 A variable name should accurately identify your variable. When you create good variable names, your JavaScript code becomes easier to understand and easier to work with. Properly naming variables is really important. JavaScript also has some rules when it comes to naming variables; read about these rules through the links below. 
 
 <ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.codeguage.com/courses/js/variables#Tips_for_naming_variables'>JavaScript Variable Naming Tips - CodeGuage</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.informit.com/articles/article.aspx?p=131025&seqNum=3'>Understanding Variables in JavaScript</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.dummies.com/article/technology/programming-web-design/javascript/naming-javascript-variables-142522/'>Naming JavaScript Variables</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.robinwieruch.de/javascript-naming-conventions/'>JavaScript Naming Conventions</BadgeLink>