Creates simple js file to show how to add js to a theme

_includes/scripts.js

@@ -0,0 +1,14 @@
+// Data attribute switch
+var toggleState	= function (elem, one, two) {
+  var elem	= document.querySelector(elem);
+  elem.setAttribute('data-state', elem.getAttribute('data-state') === one ? two : one);
+};
+
+// Mobile navigation toggle selector
+var buttonMenu = document.querySelector('.button--nav');
+  if (typeof(buttonMenu) != 'undefined' && buttonMenu != null) {
+  	buttonMenu.onclick = function (e) {
+  		toggleState('.nav', 'open', 'closed');
+  		e.preventDefault();
+  	};
+  };

_layouts/default.html

@@ -17,5 +17,6 @@
 
 		{{ content }}
 
+		<script src="/js/scripts.js" type="text/javascript"></script>
 	</body>
 </html>