feat: add addItem function to append new items to the list

ejercicios-clase-8.js

@@ -15,3 +15,12 @@ const addClass = (a) => {
         item.classList.add(a);
     });
 }
+
+// Ejercicio 3
+
+const addItem = (a) => {
+    const list = document.querySelector('ul');
+    const newItem = document.createElement('li');
+    newItem.textContent = a;
+    list.appendChild(newItem);
+}