First set of upgrade to 5.3 stuff.

routes/api.php

@@ -0,0 +1,18 @@
+<?php
+
+use Illuminate\Http\Request;
+
+/*
+|--------------------------------------------------------------------------
+| API Routes
+|--------------------------------------------------------------------------
+|
+| Here is where you can register API routes for your application. These
+| routes are loaded by the RouteServiceProvider within a group which
+| is assigned the "api" middleware group. Enjoy building your API!
+|
+*/
+
+Route::get('/user', function (Request $request) {
+    return $request->user();
+})->middleware('auth:api');