Add post model

`ember g model post`

Outer red: Your Ember app tried to POST '/posts', but there was no route defined to handle this request. Define a route that matches this path in your mirage/config.js file.

Next we get an error from Mirage, our fake server. It needs a corresponding post creation endpoint created.

app/models/post.js

@@ -0,0 +1,5 @@
+import DS from 'ember-data';
+
+export default DS.Model.extend({
+
+});

tests/unit/models/post-test.js

@@ -0,0 +1,12 @@
+import { moduleForModel, test } from 'ember-qunit';
+
+moduleForModel('post', 'Unit | Model | post', {
+  // Specify the other units that are required for this test.
+  needs: []
+});
+
+test('it exists', function(assert) {
+  let model = this.subject();
+  // let store = this.store();
+  assert.ok(!!model);
+});