first template, material ui, navigation

src/App.js

@@ -0,0 +1,18 @@
+import React from 'react';
+import { BrowserRouter as Router } from 'react-router-dom';
+import { ThemeProvider } from '@material-ui/core/styles';
+import theme from './themes';
+
+import Routes from './routes';
+
+function App() {
+  return (
+    <ThemeProvider theme={theme}>
+      <Router basename={process.env.PUBLIC_URL}>
+        <Routes />
+      </Router>
+    </ThemeProvider>
+  );
+}
+
+export default App;