remove unused packages deps and updates example and installation

example/src/index.js

@@ -1,16 +1,15 @@
-import React from "react"
-import ReactDOM from "react-dom"
-import { useCountdown} from "cubetiq-react-use-countdown"
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { useCountdown } from 'cubetiq-react-use-countdown';
 
 const App = () => {
-    const { timeleft , start } = useCountdown()
-	return (
-	<div>
+    const { timeleft, start } = useCountdown();
+    return (
+        <div>
+            <button onClick={() => start(10000)}> Start Countdown </button>
+            <h1>Time left: {timeleft}</h1>
+        </div>
+    );
+};
 
-        <button onClick={() => start(10000)}>Start Count down </button>
-		<h1>Hellos Ciybt  {timeleft}</h1>
-	</div>
-)
-}
-
-ReactDOM.render(<App /> , document.querySelector("#root"))
+ReactDOM.render(<App />, document.querySelector('#root'));