feat(dashboard):add UX for login/logout/dashboard

src/components/App/index.js

@@ -0,0 +1,24 @@
+import React, { useState, useEffect } from 'react';
+
+import Login from '../Login';
+import Dashboard from '../Dashboard';
+
+const App = () => {
+  const [isAuthenticated, setIsAuthenticated] = useState(null);
+
+  useEffect(() => {
+    setIsAuthenticated(JSON.parse(localStorage.getItem('is_authenticated')));
+  }, []);
+
+  return (
+    <>
+      {isAuthenticated ? (
+        <Dashboard setIsAuthenticated={setIsAuthenticated} />
+      ) : (
+        <Login setIsAuthenticated={setIsAuthenticated} />
+      )}
+    </>
+  );
+};
+
+export default App;

src/components/App/index.test.js

@@ -0,0 +1,8 @@
+import React from 'react';
+import { render } from '@testing-library/react';
+import App from '.';
+
+test('renders without crashing', () => {
+  const { unmount } = render(<App />);
+  unmount();
+});