add home and handle 404 page not found

app/Http/Controllers/Home/HomeController.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Http\Controllers\Home;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Http\Request;
+
+class HomeController extends Controller
+{
+    public function index(Request $request){
+        if(Auth::check()){
+            return view('index');
+        }else{
+            return view('auth.signin');
+        }
+    }
+}