added matias' work

persistance/main.js

@@ -3,12 +3,26 @@ function addItemInList(name){
     const li = document.createElement("li");
     li.innerText = name;
     document.getElementById("list1").appendChild(li);
-
 }
 
 function click(){
     const value = document.getElementById("input1").value;
     addItemInList(value);
+    addToLocalStorage(value);
+}
+
+function addToLocalStorage(value) {
+    let listeStockage = getListFromLocalStorage();
+    listeStockage.push(value);
+    localStorage.setItem("elm", JSON.stringify(listeStockage));
+}
+
+function getListFromLocalStorage() {
+    let serialized = localStorage.getItem("elm");
+    if(!serialized){
+        return []
+    }
+    return JSON.parse(serialized);
 }
 
 document.getElementById("exo1").addEventListener("click", click);