Added Docs

docs/scripts/collapse.js

@@ -0,0 +1,11 @@
+function hideAllButCurrent(){
+    //by default all submenut items are hidden
+    $("nav > ul > li > ul li").hide();
+    
+    //only current page (if it exists) should be opened
+    var file = window.location.pathname.split("/").pop();
+    $("nav > ul > li > a[href^='"+file+"']").parent().find("> ul li").show();
+}
+$( document ).ready(function() {
+    hideAllButCurrent();
+});