feat: Add the menu button if authenticated

src/components/app.tsx

@@ -3,6 +3,8 @@ import * as React from "react";
 import AppBar from "@material-ui/core/AppBar";
 import Toolbar from "@material-ui/core/Toolbar";
 import Typography from "@material-ui/core/Typography";
+import IconButton from "@material-ui/core/IconButton";
+import MenuIcon from "@material-ui/icons/Menu";
 
 import { BrowserRouter, Route, Redirect } from "react-router-dom";
 
@@ -85,6 +87,13 @@ export default class Application extends React.Component<{}, IState> {
             <div className="flex">
                 <AppBar position="static">
                     <Toolbar>
+                        {
+                            this.isAuthenticated() ? (
+                                <IconButton color="inherit">
+                                    <MenuIcon />
+                                </IconButton>
+                            ) : undefined
+                        }
                         <Typography className="flex" variant="title" color="inherit">
                             Lateinicus
                     </Typography>