Add numbers ng-init

---

examples/angular/add_numbers_ng_init.html

<script src="angular.min.js"></script>
<div ng-app ng-init="a = 19; b = 23;">
  <input ng-model="a" type="number">
  <input ng-model="b" type="number">
  <h1>{{ a + b }}</h1>
</div>