feat: 기본 Route 추가

-const App = () => {
-  return <div className='App'>Hello App</div>;
-};
+import React from 'react';
+import { BrowserRouter, Route, Switch } from 'react-router-dom';
+import Home from './pages/Home';
+
+const App = () => (
+  <BrowserRouter>
+    <Switch>
+      <Route path="/" exact component={Home} />
+    </Switch>
+  </BrowserRouter>
+);
 
 export default App;