added persistance exercice

persistance/main.js

@@ -0,0 +1,8 @@
+function click(){
+    const value = document.getElementById("input1").value;
+    const li = document.createElement("li");
+    li.innerText = value;
+    document.getElementById("list1").appendChild(li);
+}
+
+document.getElementById("exo1").addEventListener("click", click);