Added category menu (#117)

Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Reviewed-on: R11/release11-tools-web#117

Frontend/assets/scripts/frame.js

@@ -0,0 +1,23 @@
+function changeActiveTools(activeClass, activeCategoryButton) {
+    let tools = document.getElementById("toolList").children
+    
+    for (i = 0; i < tools.length; i++) {
+        if (tools[i].classList.contains(activeClass)) {
+            tools[i].style.display = "block";
+        }
+        else {
+            tools[i].style.display = "none";
+        }
+    }
+
+    let categories = document.getElementById("menu").children
+
+    for (i = 0; i < categories.length; i++) {
+        if (categories[i].innerText == activeCategoryButton) {
+            categories[i].classList.add("active")
+        }
+        else {
+            categories[i].classList.remove("active")
+        }
+    }
+}