fix: add missing component

Author: aklkv

test-app/lib/ember-chat/addon/components/spanish-greeting.hbs

@@ -0,0 +1,3 @@
+<span class="greeting">Hola</span> from {{@name}}!
+<button class="clicker" type="button" {{on "click" this.click}}>Clicker</button>
+<span class="click-count">{{this.clickCount}}</span>

test-app/lib/ember-chat/addon/components/spanish-greeting.js

@@ -0,0 +1,11 @@
+import Component from '@glimmer/component';
+import { tracked } from '@glimmer/tracking';
+import { action } from '@ember/object';
+
+export default class extends Component {
+  @tracked clickCount = 0;
+
+  @action click() {
+    this.clickCount++;
+  }
+}