First invoice implementation.

app/Http/Controllers/InvoiceController.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Invoice;
+use Illuminate\Http\Request;
+
+class InvoiceController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     */
+    public function index()
+    {
+        return view('invoice.index');
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     */
+    public function create()
+    {
+        return view('invoice.create');
+    }
+
+    /**
+     * Display the specified resource.
+     */
+    public function show(Invoice $invoice)
+    {
+        return view('invoice.show', ['invoice' => $invoice]);
+    }
+
+    /**
+     * Show the form for editing the specified resource.
+     */
+    public function edit(Invoice $invoice)
+    {
+        //
+    }
+}