[add] reportWebVitals got add it back to the project since I delete t…

…hem by mistake at the begining of the project due to lack of knowledge

src/index.js

@@ -2,10 +2,16 @@ import React from "react";
 import ReactDOM from "react-dom/client";
 import "./index.css";
 import App from "./App";
+import reportWebVitals from "./reportWebVitals";
 
 const root = ReactDOM.createRoot(document.getElementById("root"));
 root.render(
   <React.StrictMode>
     <App />
   </React.StrictMode>
 );
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = onPerfEntry => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;