create welcome and category screens

kivi-cars/src/App.js

@@ -1,10 +1,15 @@
 import './App.css';
+import React from 'react';
+import Category from './components /Categories';
+import Welcome from './components /Welcome';
+
 
 function App() {
   return (
     <div className="App">
-      <h1>Hello</h1>
+      <Category />
     </div>
+ 
   );
 }