Add fullstack example

examples/fullstack/backend/start/routes.ts

@@ -0,0 +1,17 @@
+/*
+|--------------------------------------------------------------------------
+| Routes file
+|--------------------------------------------------------------------------
+|
+| The routes file is used for defining the HTTP routes.
+|
+*/
+
+import router from '@adonisjs/core/services/router'
+import UsersController from '#controllers/users_controller'
+router.get('users', [UsersController, 'index'])
+router.get('/', async () => {
+  return {
+    hello: 'world',
+  }
+})